Page 1
Liebert®
iCOM™
Installer/User Guide
Intelligent Communication and Monitoring
Page 2
The information contained in this document is subject to change
without notice and may not be suitable for all applications. While
every precaution has been taken to ensure the accuracy and
completeness of this document, Vertiv assumes no responsibility
and disclaims all liability for damages resulting from use of this
information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods,
tools, and materials to be used in performing procedures not
specifically described in this document.
The products covered by this instruction manual are manufactured
and/or sold by Vertiv. This document is the property of Vertiv and
contains confidential and proprietary information owned by Vertiv.
Any copying, use or disclosure of it without the written permission
of Vertiv is strictly prohibited.
Names of companies and products are trademarks or registered
trademarks of the respective companies. Any questions regarding
usage of trademark names should be directed to the original
manufacturer.
Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent
section of this manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.VertivCo.com/en-us/support/ for additional assistance.
Vertiv™ | Liebert® iCOM™Installer/User G uide
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TABLE OF CONTENTS
1 Getting Started with iCOM 1
1.1 Touchscreen Display and User Interface 1
1.2 Touchscreen Status Dial 3
1.2.1 Dial Background-color Status Indication 5
1.3 Control Header 6
1.3.1 Powering-on iCOM and Logging-in/Unlocking Controls 6
1.3.2 Powering-on the Thermal Management Unit 7
1.3.3 Powering-off the Thermal Management Unit 8
1.3.4 Logging Out 8
1.3.5 Calibrating the Touchscreen 9
1.3.6 Setting the Date and Time 9
1.3.7 Searching 9
1.4 Using Context-sensitive Help 10
1.5 About iCOM Version 10
1.6 Accessing the User, Service and Advanced Menus 10
1.7 User Menu 10
1.8 Service Menu 11
1.9 Advanced Menu 12
2 User Operation 15
2.1 Viewing and Editing setpoints for the cooling unit 15
2.1.1 Editing Humidity Setpoints 15
2.1.2 Editing Temperature Setpoints 16
2.2 Viewing Unit Alarms 17
2.2.1 Silencing an Audible Alarm 18
2.2.2 Acknowledging Alarms 18
2.3 Viewing the Event Log 20
2.4 Viewing Sensor Data 20
2.5 Managing Run Hours for a Component 20
2.5.1 Setting run hours to zero 21
2.6 Viewing EconoPhase Operation 21
2.7 Viewing Teamwork, Stand-by, andCascade Status 22
3 Service Operation 23
3.1 Editing setpoints for the cooling unit 23
3.1.1 Configuring Temperature Setpoints 23
3.1.2 Temperature Control –TemperatureSetpointsandCooling Operation 26
3.1.3 Compressor Control by Cooling Requirement 28
3.1.4 Setting temperature compensation 37
3.1.5 Configuring high/low-limit setpoints 38
3.1.6 Configuring humidity setpoints 39
3.1.7 Humidity Control 41
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3.1.8 Configuring Fan Setpoints 43
3.1.9 Manual Fan-speed Control 45
3.1.10 Automatic Fan-speed Control 46
3.1.11 Configuring Static-pressure Setpoints 47
3.2 Scheduling Condenser and Cooling-unit Tasks 48
3.2.1 Scheduling Condenser Low-noise Operation 49
3.2.2 Scheduling Condenser-fan Reversal 50
3.2.3 Scheduling “Sleep” Times for Thermal-management Units 50
3.3 Setting General Thermal-management Unit Options 51
3.3.1 Setting Miscellaneous Options 51
3.3.2 Automatic Restart after Power Failure 52
3.3.3 Setting Fan Options 53
3.3.4 Setting Compressor Options 54
3.3.5 Setting Reheat Options 56
3.3.6 Reheat Control 57
3.3.7 Setting Humidifier Options 64
3.3.8 Setting Dehumidification Options 65
3.3.9 Setting Water-leak Detector Options 65
3.3.10 Setting Q15 options 66
4 Managing Events: Alarms,WarningsandMessages 69
4.1 Event Properties 69
4.2 Enabling Events and EditingEventSettings 70
4.3 Selecting Event Type and SettingAlarm/WarningNotification 71
4.4 Enabling the Audible Alarm Notification 81
4.5 Remote-alarm Device and Customer-input Events 82
4.5.1 Setting-up Customer-input Events 82
5 U2U Networking 87
5.1 Preparing for U2U Group Set-up 87
5.2 Configuring U2U Network Settings 89
5.2.1 Troubleshooting Network-settings Issues 91
5.2.2 Modifying U2U Network Settings 91
6 Teamwork, Stand-by and RotationforCoolingUnits 93
6.1 Continuous Control with Virtual Master 93
6.2 Teamwork Modes 93
6.2.1 No Teamwork—Multiple Zones in One Room 95
6.2.2 Teamwork Mode 1—Parallel Operation 96
6.2.3 Teamwork Mode 2—Independent Operation 96
6.2.4 Teamwork Mode3—Optimized-aisle Operation 96
6.3 Assigning Cooling Units to Stand-by (Lead/Lag) 97
6.4 Setting a Rotation Schedule 99
6.4.1 Manually Rotating the Operating and Stand-by Units 100
7 Configuring Economizer Operation 101
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7.1 Fluid Economizers 101
7.1.1 Overriding Fluid Economizer Operation 102
7.1.2 Setting-up Fluid Economizer Operation 102
7.1.3 Temperature Control with a Fluid Economizer 104
7.1.4 Viewing Fluid Economizer Statuses 107
8 External Monitoring andBuilding-managementSystems 109
8.1 BMS and IntelliSlot Settings 109
8.1.1 Configuring BMS Communication with IntelliSlot Card 110
8.1.2 Setting BMS Control Settings 110
8.1.3 Setting BMS Back-up Setpoints 111
9 Configuring Auxiliary Devices 113
9.1 Power Monitoring 113
9.2 Fluid-temperature Monitoring 114
9.3 Configuring Analog-input Devices 114
9.4 Wired Remote Sensors 116
9.5 Supply Sensors 118
10 Administering Firmware, Settings and Security 119
10.1 iCOM firmware upgrades 119
10.1.1 Compatibility with earlier versions of iCOM 119
10.1.2 Updating iCOM display firmware 119
10.1.3 Updating iCOM Control-board Firmware 119
10.2 Backing-up, Importing/Exporting and Restoring Display Settings 121
10.2.1 Resetting display settings to defaults 121
10.3 Backing-up and Restoring Control-board Settings 122
10.4 Managing access permission and Passwords 123
10.5 Configuring with the Start-up Wizard 124
11 Performing Diagnostics 125
11.1 Cooling-unit status LED 125
11.2 Enabling manual mode for diagnostics 125
11.2.1 Disabling diagnostics manual mode 126
11.3 Diagnosing evaporator-fan issues 126
11.4 Diagnosing compressor-circuit issues 127
11.4.1 Resetting High-pressure Alarm Code 128
11.4.2 Resetting Low-pressure Alarm Code 128
11.4.3 Resetting High-temperature Alarm Counter 129
11.5 Diagnosing electronic-expansion-valve issues 129
11.5.1 Resetting EEV Battery-failure Counter 130
11.6 Diagnosing EconoPhase issues 130
11.7 Diagnosing reheat issues 131
11.8 Diagnosing humidifier issues 131
11.9 Diagnosing digital-output issues 132
11.10 Diagnosing analog-output issues 132
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11.11 Diagnosing customer-input issues 133
11.12 Diagnosing water/leak detection issues 133
12 Customizing Your iCOM Display 135
12.1 Setting general display properties 135
12.2 Customizing main-display views 136
12.2.1 Moving Content 136
12.2.2 Re-sizing Content 136
12.2.3 Adding and Adjusting Content 137
12.2.4 Removing Content 138
12.3 Customizing parameter and field labels 138
12.3.1 Exporting, Importing and Customizing labels using a text editor 140
13 Hardware Installation 143
13.1 Installing Wired Remote Sensors 143
13.1.1 Setting DIP switches and labeling 2T sensors 143
13.1.2 Terminating the last sensor on the CANbus link 146
13.1.3 Installing 2T sensors in the racks to monitor 148
13.1.4 Connect the CANbus cable and ground 150
13.2 Installing a Fluid-temperature Sensor 152
13.3 Installing Supply-control Sensors 154
13.3.1 Installing the supply-air temperature sensor 154
13.3.2 Installing aggregated supply-air temperature sensors 156
13.4 Installing Analog-input Devices 159
13.5 Installing the U2U Network 160
13.5.1 Required network equipment 160
13.5.2 Plan wiring runs 160
13.5.3 U2U Wiring connection 161
13.5.4 Wiring Cooling Units without Wall-mount Displays 162
13.5.5 Wiring Cooling Units with Wall-mount Displays 164
Appendices 165
Appendix A: Technical Support and Contacts 165
Appendix B: Setpoints and Alarm Settings by Line ID 167
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1 GETTING STARTED WITH ICOM
The Liebert® iCOM offers the highest capability for unit control, communication, and monitoring of
Liebert® Thermal Management units. It is available factory-installed on new units and assemblies or may
be retrofitted in existing units.
1.1 Touchscreen Display and User Interface
The Liebert® iCOM touchscreen and user interface speeds set up and installation and simplifies control of
Liebert® thermal-management units, literally putting cooling-system monitoring and management at
your fingertips.
• The resistive touchscreen is used with a firm touch, or consider using a stylus when interacting
with the touchscreen.
• User and service menus are password-protected to prevent unauthorized changes to coolingunit operation.
• The touchscreen is back-lit and auto-dims after a period on non-use, then turns off. Touch the
screen to illuminate the main screen.
• iCOM ships with default settings for efficient and effective operation of most cooling-units and
is easily configured to meet any need.
• iCOM menus and displays are based on the options installed on the cooling units that it
monitors and manages.
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Figure 1.1 iCOM main display
Table 1.1 Main Display controls and options
Item Description
1 Alarms present. Displays the number of active alarms.
2 Menu icon. When unlocked, displays a menu for user or service options depending on which icon is selected.
User icon. When selected, the user options are available on the main display and menu.
3
NOTE: You must unlock the display with the User PIN to access the menu and options.
See Powering-on iCOM and Logging-in/Unlocking Controls on page6.
Service icon. When selected, the service options are available on the main display and menu.
4
NOTE: You must unlock the display with the Service PIN to access the menu and options.
See Powering-on iCOM and Logging-in/Unlocking Controls on page6.
Advanced icon. When selected, the advanced options are available on the main display and menu.
5
NOTE: You must unlock the display with the Service PIN to access the menu and read-only options.
See Powering-on iCOM and Logging-in/Unlocking Controls on page6.
Cooling-unit parameters. Status displayof selected system parameter settings. See AddingandAdjustingContent on
6
page137
7 Unit Identification. You may customize the unit name up to 6 characters/numbers.
8 Search icon. Open the keyboard to search for controls and setting locations. See Searchingon page9.
9 Date/Time.
Lock/Unlock icon. Indicates w hether or not the user and service options are accessible.
10
• Locked icon = displayis read-only
• Unlocked icon = User or service is logged-in and options are accessible.
See Powering-on iCOM and Logging-in/Unlocking Controls on page6.
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Table 1.1 Main Display controls and options (continued)
Item Description
Secondary-content panel. When accessing settings/configuration via the menus, the settings display in the right,
11
“secondary” panel.
Summary of current unit function. You c an customize to show fanspeed, cooling, percentages from anyinstalled device, and
12
anyphysical (sensor) values.
13 Status Dial. Circular displayof setpoints and environmental conditionsof the unit. See Touchscreen Status Dial below.
Teamwork-mode icon. In a panel with “Status”content, the Teamwork Mode icon indicates the mode selected. For details
14
and descriptions of the teamwork controls, see Teamwork Modes on page93.
15 Control header. Controls to access the user and service menus. See Control Header on page6.
16 Status Header. Displays the alarm status, unit identification, and the current date and time.
1.2 Touchscreen Status Dial
The dial in the primary-control panel displays read-only control sensors, setpoints, and environmental
conditions for unit status at a glance. See Figure 1.2 on the next page.
The center of the dial displays sensor readings and changes color according to alarm thresholds as the
readings rise and fall, see Dial Background-color Status Indication on page5.
Touching the center of the dial cycles through a set of sensor settings, and you can select the readings
displayed, see Adding and Adjusting Content on page137.
1 Getting Startedwith iCOM
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Figure 1.2 Dial sections
Table 1.2 Dial Sections
Item Description
Control sensor and its setpoint. The sensors and setpoints displayed depend on the configuration of your unit.
You may see only temperature-control, or if the unit includes humidity control, that displays on the dialas well.
1
If the sensor selected for fan control is the same as that selected for temperature control, the dialdisplays the fan-control
sensor and setpoint, as shown in Figure 1.2 above.
2 Single or multiple sensor readings. Cycle through readings by touching the displayed reading.
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1.2.1 Dial Background-color Status Indication
The background color of the dial indicates whether or not the unit is powered-on, and it also responds to
threshold settings of the control-sensor reading, see Figure 1.3 below. Table 1.3 on the next page
describes the background color displayed if the selected sensor reading has threshold limits set.
Figure 1.3 Dial background colors
Item Description
1 Sensor reading is within threshold limits.
2 Unit is powered-off.
3 Sensor reading is above thresholdlimit or the unit is in an "alarm" condition.
4 Sensor reading is below threshold limit
Table 1.3 Background color displayed by selected value
and threshold limit
Sensor/Value selected Threshold limit Background color
Return Temp
Return Humidity
Dew Point
Supply Temp
Average Rack Temp
None Blue
High return temperature Red
Low return humidity Blue
High return humidity Red
Low dew point Blue
High dew point Red
Low supplytemperature Blue
High supplytemperature Red
Low remote temperature Blue
High remote temperature Red
1 Getting Startedwith iCOM
MaxRack Temp
Low remote temperature Blue
High remote temperature Red
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Table 1.3 Background color displayed by selected value
and threshold limit (continued)
Sensor/Value selected Threshold limit Background color
Min Rack Temp
Static Pressure
Outdoor Temp None Green
Outdoor Humidity None Green
Low remote temperature Blue
High remote temperature Red
Low static pressure Blue
High static pressure Red
1.3 Control Header
The control header contains the controls to access the user and service settings. The display is locked
when started initially and when restarted after a period of inactivity.
1.3.1 Powering-on iCOM and Logging-in/Unlocking Controls
iCOM is powered-on when power is switched on at the cooling unit’s disconnect switch and you activate
the display by touching it.
iCOM is locked when started and also locks after a period of inactivity to prevent unauthorized changes. A
4-digit password is required to access the user and service menus and options, and the advance menu
displays as read-only when logged-in at the service level.
NOTE: The factory-default inactivity period is 1 minute. To change the inactivity period, see Setting
general display properties on page135.
NOTE: The factory-default passord for user and service login are provided. We recommend you change
passwords as necessary to prevent unauthorized changes. See Managing access permission and
Passwords on page123.
• Default User password = 1490
• Default Service password = 5010
To unlock the controls:
1. On the header, touch .
The keypad opens.
2. Touch the numbers/characters for your password, then touch .
Depending on the password entered and your level of access, the User and/or Service options
view-only access to the Advanced menu are accessible. See Accessing the User, Service and
Advanced Menus on page10.
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1.3.2 Powering-on the Thermal Management Unit
NOTE: Depending on the operating state, there are start/stop priority switches that may prevent the
cooling unit from operating even though power to the unit is switched on and you have turned it on via
iCOM.
The cooling unit operates only when all switches are closed. For example, even though you have
turned-on the unit through iCOM, if the BMS remote-monitoring system is sending a command to turnoff the unit, the cooling unit remains off.
NOTE: You must be logged-in to access the menu options. See Powering-on iCOM and Logging-
in/Unlocking Controls on the previous page.
To power-on the unit:
1. Touch , then >Turn Unit On.
The TURN UNIT ON dialog opens.
2. Touch Turn Unit On.
The cooling unit starts and the operating status is displayed as shown in Figure 1.4 below.
Figure 1.4 Unit status on iCOM display
1 Getting Startedwith iCOM
Item Description
1 Current status of the unit. See Cooling-unit statuses displayed on the next page.
2 Teamwork icon. See ViewingTeamwork , Stand-by, andCascade Status on page22.
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Table 1.4 Cooling-unit statuses displayed
Unit Status
Text
ALARMOFF An alarm forced the unit to turn off. See ViewingUnit Alarms on page17.
MANUAL Controlled by a service technician. See Enabling manualmode for diagnostics on page125.
DISPLAY OFF
ALARM
STANDBY
STANDBY In standbybecause of service-menu setting. See Assigning Cooling Units to Stand-by (Lead/Lag) on page97.
TIMER OFF
UNIT ON Operatingnormally without alarms or warnings.
WARNING ON Active warning, but stilloperating. See Viewing Unit Alarms on page17.
ALARMON Active alarm, but stilloperating. See Viewing Unit Alarms on page17.
TIMER
REMOTE OFF
MONITORING
OFF
Description
Unit is turned Off at the iCOM display. See Powering-on the Thermal Management Unit on the previous page.
In stand-bybecause of an active alarm on the unit. See Viewing Unit Alarms on page17.
Scheduled on a timer and is in “sleep” mode waitingfor the next start interval. See Scheduling Condenser and
Cooling-unit Tasks on page48.
Scheduled on a timer to operate, and is in operating mode. See Scheduling Condenser andCooling-unit Tasks on
page48.
Turned-off by remote shutdown terminal.
Occurs when a normally-closed set of 24-V contacts opens. The Remote On/Offand DisplayOn/Off switches are in
series, and the cooling unit will only turn-on if both switches are “on/closed.” If one is “off/open,” the unit turns off.
Turned-off by remote monitoring system.
Check the remote monitoringdevice or call Vertiv™ technical support for assistance.
BACK-DRAFT Unit is non-operational, but EC fan is operating as a back-draft damper.
RESTART
DELAY
Not yet operational after a power cycle because the restart-delay timer is active.
1.3.3 Powering-off the Thermal Management Unit
NOTE: You must be logged-in to access the menu options. See Powering-on iCOM and Logging-
in/Unlocking Controls on page6.
1. Touch , then >Turn Unit Off.
The TURN UNIT OFF panel opens.
2. Touch Turn Unit Off.
The unit begins a power-off countdown then powers-off.
1.3.4 Logging Out
Log-out occurs automatically when the display back light turns-off for inactivity.
NOTE: The factory-default inactivity period is 1 minute. To change the inactivity period, see Setting
general display properties on page135
• To log-out manually, touch the lock icon.
The icon indicates “locked.”
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1.3.5 Calibrating the Touchscreen
Use a firm touch or a stylus for the best response. To improve interaction with quicker and more-accurate
touch response, calibrate the touchscreen.
1. On the User menu, touch Display Options > Display Properties.
2. On the UNIT DISPLAY panel, touch Calibrate Screen and follow the prompts to calibrate.
• If you cannot access the calibration because of screen response, continue with step 3.
3. At the cooling-unit disconnect switch, power-off the unit and then back on.
4. Touch your finger to the screen and hold it there while the display boots.
5. When the LED begins flashing, remove your finger.
Cross-hairs appear in each corner and in the center of the display.
6. Touch the center of each cross-hair ONCE ONLY. (Touching more than once interrupts the
calibration and you must start over at step 3.)
Cross-hairs disappear and the display reboots when calibration is complete.
1.3.6 Setting the Date and Time
The correct date and time is critical for warnings, alarms, and scheduling.
1. Touch , then > Display Options > Display Properties > Date &Time.
2. Touch the date field, use the arrows to select the date, and touch OK.
– or –
Touch the time field, use the arrows to set the time, and touch OK.
3. Select the date and time format if necessary.
4. Touch Save.
1.3.7 Searching
When logged-in, you can use the display search to find the location of settings options based on a term,
service code, or parameter. You can also search by the line ID used in the iCOM before the touchscreen
model. For a listing of the line IDs, see Setpoints and Alarm Settings by Line ID on page167.
NOTE: You must be logged-in to access the display search. See Powering-on iCOM and Logging-
in/Unlocking Controls on page6.
1. In the control header, touch the search field.
The keyboard opens.
2. Type the term and touch .
A list of locations that contain the searched term opens.
3. To go to a listed location, touch an item, then touch Go.
The panel for the selected location opens.
– or –
To view the service codes and parameter entries related to the searched term, touch View
Parameter Directory Entries (the number of related entries is included in the option).
The Parameter Directory opens. You may further refine the search in the directory.
1 Getting Startedwith iCOM
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1.4 Using Context-sensitive Help
Touching the Help icon, , on the right-hand side of the display opens the Help drawer with
information about the panel or dialog currently on the display.
You can use search and the topic index to find further information.
To close the Help drawer, touch the close arrow, .
1.5 About iCOM Version
The version, build, and other firmware information for the iCOM display board may be helpful when
servicing or troubleshooting. To locate the firmware version of the iCOM control board, see Updating
iCOM Control-board Firmware on page119.
• Touch , then > About.
The ABOUT panel opens.
1.6 Accessing the User, Service and Advanced Menus
iCOM operating functions that monitor and control a cooling unit are accessed via the User and Service
menus.
NOTE: You must be logged-in to access the menu options. See Powering-on iCOM and Logging-
in/Unlocking Controls on page6.
1. To access a menu, touch the icon for the menu you want, , or , in the control
header, see Control Header on page6.
The orange bar appears below the menu name when selected indicating that this is the menu
content that will be displayed.
2. Touch the menu icon, .
The menu opens.
1.7 User Menu
The user menu lets you view system and unit statuses and edit some setpoints.
User menu options
Setpoints
Opens the SETPOINTS panel. See Viewing and Editing setpoints for the cooling unit on page15.
Active Alarms
Opens the ALARMS panel. See Viewing Unit Alarms on page17.
Event Log
Opens the EVENT LOG panel. See Viewing the Event Log on page20.
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Sensor Data
Opens the SENSOR DATA panel. See Viewing Sensor Data on page20.
Display Options
Opens the Display Options menu:
• Customize Layout—see Customizing main-display views on page136.
• Custom Labels—see Customizing parameter and field labels on page138.
• Date & Time—see Setting the Date and Time on page9.
Total Run Hours
Opens the RUN HOURS panel. See Managing Run Hours for a Component on page20.
EconoPhase
Opens the ECONOPHASE - PUMP MODE panel.
About
Opens the ABOUT panel. See About iCOM Version on the previous page.
Turn Unit On/Off
Depending on unit’s status, open the TURN UNIT ON or TURN UNIT OFF dialog. See Powering-on
the Thermal Management Unit on page7, or Powering-off the Thermal Management Unit on page8.
1.8 Service Menu
The service menu lets you view and edit setpoints and perform many other functions.
Service Menu Options
Setpoints
Opens the SETPOINTS panel. See Editing setpoints for the cooling unit on page23, .
Diagnostic/Service
Opens the Diagnostic / Service menu:
• Diagnostics—see Performing Diagnostics on page125.
• EconoPhase View—Opens the ECONOPHASE - PUMP MODE panel.
• Technical Support—contact information for the cooling unit and iCOM display.
Alarm/Event Setup
Opens the ALARMS & EVENTS panel. See Managing Events: Alarms,WarningsandMessages on
page69, .
1 Getting Startedwith iCOM
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BMS & Teamwork
Opens the BMS & Teamwork menu:
• U2U Setup—See Configuring U2U Network Settings on page89.
• Teamwork/Standby—See Teamwork, Stand-by and RotationforCoolingUnits on
page93.
• BMS Setup—See BMS and IntelliSlot Settings on page109.
Scheduler
Opens the SCHEDULER panel. See Scheduling Condenser and Cooling-unit Tasks on page48.
Options Setup
Opens the OPTIONS SETUP panel. See Setting General Thermal-management Unit Options on
page51.
Auxiliary Device Setup
Opens the Auxiliary Device Setup menu:
• Sensors—See Wired Remote Sensors on page116.
• Analog Input—See Configuring Analog-input Devices on page114.
• Modbus Devices
• CapCom
Backup & Security
Opens the Backup & Security menu:
• Display Backup and Restore. See Backing-up, Importing/Exporting and Restoring Display
Settings on page121.
• Control Backup and Restore. See Backing-up and Restoring Control-board Settings on
page122.
• Display Upgrade. See Updating iCOM display firmware on page119.
• Control Upgrade. See Updating iCOM Control-board Firmware on page119.
• Manage Permissions. See Managing access permission and Passwords on page123.
Turn Unit On/Off
Depending on unit’s status, open the TURN UNIT ON or TURN UNIT OFF dialog. See Powering-on
the Thermal Management Unit on page7, or Powering-off the Thermal Management Unit on page8.
1.9 Advanced Menu
The advanced menu provides a read-only view of the advanced set-up and factory-level settings.
Advanced Menu Options
Factory Settings
Unit-code and configuration settings.
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Diagnostics
Details about control and cooling operation.
Expert Settings
Parameters and settings for use by trained professionals only.
Compressor Info
Details about compressor state and operating mode.
Tandem Info
Details about tandem compressor states and operating modes.
MBV Settings
Motorized ball valve settings (water-cooled heat rejection).
Runtime Monitoring
Details about component run times.
Modbus Devices
Information about connected Modbus devices such as power and flow meters.
Control Override
Allows simulating events and override of analog outputs beyond normal limits.
EEVSettings
Electronic expansion valve settings.
EconoPhase
Details about EconoPhase pumping unit.
MCCondenser
Details about MC condenser (air-cooled heat rejection),
Parameter Directory
A searchable list of all parameters in the user interface. See Setpoints and Alarm Settings by Line ID
on page167.
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2 USER OPERATION
2.1 Viewing and Editing setpoints for the cooling unit
NOTE: User-level access allows viewing and editing only a limited number of setpoints. To view or
adjust all setpoints, you must have service-level access. See Editing setpoints for the cooling unit on
page23.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, the options on your iCOM display may differ.
2.1.1 Editing Humidity Setpoints
1. Touch , then >Setpoints. > Humidity Control.
The HUMIDITY CONTROL secondary panel opens.
2. Refer to the User humidity-setpoint options below and Humidity Control on page41 to adjust
thesetpointoptions, then touch Save.
The setpoint is updated.
• Touch Cancel to discard the changes.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
User humidity-setpoint options
Dewpoint Setpoint
Desired dewpoint (based on actual return-air temperature and humidity) by adding moisture to or
removing moisture from the air.
Humidity Control Sensor
Selects sensor used when calculating relative humidity.
Humidity Control Type
Control when staging humidification operations. Valid values:
• Relative = Percent of humidification/dehumidification is determined by the difference between
the humidity-sensor reading and the humidity setpoint.
• Compensated = Percent of humidification/dehumidification is determined by considering the
actual deviation from the temperature setpoint and adjusts the humidity setpoint accordingly.
The recalculated humidity setpoint displays on the screen.
• Predictive = Percent of humidification/dehumidification is determined by considering the
actual deviation from the temperature setpoint and adjusts the humidity sensor reading
accordingly. The adjusted humidity sensor reading displays on the screen.
• Dewpoint = Percent of humidification/dehumidification is determined by the difference
between the dewpoint calculated from the humidity-sensor reading and the dewpoint setpoint.
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Humidity Setpoint
Desired humidity level by adding moisture to or removing moisture from the air.
Humidity Setpoint 2
Alternate setpoint activated by customer input (remote-alarm device/RAD). When customer input
connection = 2nd Setpoint, this value becomes the active humidity setpoint.
2.1.2 Editing Temperature Setpoints
1. Touch , then > Setpoints > Temperature Control.
The TEMPERATURE CONTROL secondary panel opens.
2. Refer to User temperature setpoint options below, Temperature Control –
TemperatureSetpointsandCooling Operation on page26, and Compressor Control by
Cooling Requirement on page28 to adjust the setpoint options, then touch Save.
The setpoint is updated.
• Touch Cancel to discard the changes.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
User temperature setpoint options
2nd Temperature Setpoint
Alternate setpoint activated by customer input (remote-alarm device/RAD). When customer input
connection = 2nd Setpoint, this value becomes the active temperature setpoint.
BMS Backup Temp Setpoint
Selects a temperature setpoint that activates in the event of a BMS timeout. The BMS timer must be
configured for this setpoint to activate. See Setting BMS Back-up Setpoints on page111.
Optimized Aisle Enabled
Read-only. Indicates that iCOM is configured for optimized-aisle operation. See Teamwork Mode3—
Optimized-aisle Operation on page96.
Temperature Control Sensor
Selects sensor that controls cooling. Values are:
• Supply Sensor = Temperature control is based on maintaining the temperature of the
discharge air from the cooling unit. See Supply Sensors on page118.
• Remote Sensor = Temperature control is based on the temperature reading(s) from wired
remote sensor(s). See Wired Remote Sensors on page116.
• Return Sensor = Temperature control is based on maintaining the temperature of the air
returning to the cooling unit.
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Temperature Setpoint Act
Read-only display of adjusted temperature setpoint when one of the following is active:
• Temperature compensation
• BMS back-up temperature setpoint
• Customer-input setpoint (remote-alarm device)
Temperature Setpoint
Temperature that the unit maintains via cooling/reheat.
2.2 Viewing Unit Alarms
The ALARMS panel lists active alarm and warning events. Table 2.1 below describes the type and state
of the alarm shown by indicator dots.
Table 2.1 Alarm status/type indicators
Indicator Description
Yellow dot Warning event.
Red dot Alarm event.
Circle Event condition has cleared, but still must be acknowledged. See Acknowledging Alarms on the next page.
To view alarms:
1. Touch , then > Alarms.
The ALARMS panel opens.
2. Touch an alarm to display the ALARM DETAILS panel.
Alarm fields
Alarm
Name of the event.
Date
Date event was logged.
Time
Time event was logged
Alarm-detail fields
Alarm
Name of the event.
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Alarm Type
Number representing the event type.
• 1 = Warning
• 2 = Alarm
Date/Time
Date and time the event was logged.
Duration
Time elapsed since event was logged.
Threshold
Sensor-reading at which an event is triggered.
Unit
Cooling unit to which the alarm applies.
Value
The current value to which the threshold is compared.
2.2.1 Silencing an Audible Alarm
Touch the screen to silence an audible alarm. If the alarm is non-latching, the alarm silences when the
condition clears.
NOTE: The audible alarm must be enabled in display options to sound. See Enabling the Audible Alarm
Notification on page81.
2.2.2 Acknowledging Alarms
Depending on the notification settings, alarms and warnings must be acknowledged or reset. An event is
active as long as it is unacknowledged, with the exception of the network-failure events described in
Table 2.2 on the facing page. Once acknowledged, an event remains active until the situation that
triggered the event is resolved, see Table 2.1 on the previous page, for event-status indicators. When an
event acknowledged and cleared, it is removed from the Alarms panel and the LED stops flashing red.
NOTE: Acknowledging alarm events does not clear them. To clear an issue, it must be corrected, reset
automatically by the controller, or reset manually.
To acknowledge alarms:
1. On the ALARMS panel, touch Acknowledge All.
A check mark overlays the status indicator of the active alarms and warnings, and these
automatically clear when the condition is no longer present.
• If a critical event must be manually reset, the acknowledged items are listed with a Reset
All button on the ALARMS panel.
2. Touch Reset All to manually reset the condition.
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Table 2.2 Events that clear without acknowledgment
Network Failure Descr iption
The iCOM I/O board assigned as U2U address number XX (two up to thirty-two) has lost communication
UNIT XX
DISCONNECTED
NO CONNECTION
W/UNIT 1
with the group.
Make sure allunits are powered-on at the disconnect.
Check cable connections and network settingswhere applicable.
The iCOM I/O board assigned as U2U address number 1 has lost communication with the group.
Make sure allunits are power on at the disconnect.
Check cable connections and network settingswhere applicable.
BMS DISCONNECT
The BMS/BAS has not completed a handshake within the time defined by the BMS/BAS.
Verify monitoring connections and communication to the BMS/BAS panel.
UNIT COD E MISSING The factory unit c ode must be confirmed, saved andexecuted.
UNIT COD E
MISMATCH
AMBIENT SENSOR
FAILURE
CAN GC 1 or 2 COMM
ERR
The factory unit code must be confirmed, saved and executed.
The outdoor temperature / humidity sensor used on the air ec onomizer unit has become disconnected or
is no longer working properly.
See Events specific to Liebert MC Condenser (continued) on page77.
CAN PB COMM ERR See Events specific to Liebert EconoPhase (continued) on page79.
CAN EEV 1or 2 COMM
ERR
COMP 1 or 2
OVERLOAD
LOW PRESS CIRCUIT
1 or 2
See Events specific to EEV alarm board on page81
See Events specific to Liebert DSEcompressor on page80.
See Events specific to Liebert DSEcompressor on page80.
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2.3 Viewing the Event Log
The event log is a list by date/time of the last 400 events generated by iCOM for the thermalmanagement unit.
• On the User menu, touch Event Log.
The EVENT LOG for the cooling unit opens. Table 2.3 below describes the color-coded status
for each event.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, the options on your iCOM display may differ.
Table 2.3 Event status/type indicators
Indicator Description
Green dot Message.
Yellow dot Unacknowledged warning event. See AcknowledgingAlarms on page18.
Red dot Unacknowledged alarm event. See Acknowledging Alarms on page18.
White dot with check-mark overlay Acknowledged event, the cause still exists.
White circle Acknowledged event, the cause is c leared.
2.4 Viewing Sensor Data
The Sensor Data panel lists the standard and optional sensors monitored by iCOM and the current
reading of each sensor.
• Touch , then > Sensor Data.
The SENSOR DATA panel opens.
A secondary panel displays the DAILY SENSOR READING SUMMARY, which shows
temperature, humidity and dew-point readings for the cooling unit.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, the options on your iCOM display may differ.
2.5 Managing Run Hours for a Component
You can view the run hours for components on a cooling unit, set the total-run-time limit, and reset total
run hours to zero.
1. Touch , then > Total Run Hours.
The RUN HOURS panel opens and the current hours for each component are listed in the
Total Run Hours column.
To reset the total run hours to zero, see Setting run hours to zero on the facing page.
2. Use the slider to set the total-run-time limit for each component, then touch Save.
The limits are set.
20
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, the options on your iCOM display may differ.
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2.5.1 Setting run hours to zero
1. On the RUN HOURS panel, touch to check each box in the Total Run Hours column next to the
component(s) to reset.
The Set to Zero button becomes available.
2. Touch Set to Zero.
The total run hours for selected component(s) is set to zero.
2.6 Viewing EconoPhase Operation
When your Thermal Management System is a Liebert® DSE system with a Liebert® EconoPhase pumpedrefrigerant economizer (PRE) and a Liebert® MC or MCV condenser, the EconoPhase screen, Figure 2.1
below, shows the operating mode of the system. The DSE System Optimization feature is automatically
employed and reduces power consumption significantly because a PRE package consumes about onetenth the power of the compressors.
EconoPhase operation saves energy by eliminating compressor operation when outdoor ambient
temperatures are cool enough, or when the difference between the indoor and outdoor ambient
temperature is satisfied. DSE System Optimization further improves efficiency by optimizing liquidrefrigerant-temperature and pressure setpoints in mid- and high-ambient temperature conditions, thus
reducing the operation of condenser fans while maintaining the appropriate heat-rejection capacity.
Figure 2.1 EconoPhase - Pump Mode screen
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2.7 Viewing Teamwork, Stand-by, andCascade Status
In the main User panel, the Teamwork Mode icon indicates the mode selected, Figure 2.2 below.
To view the teamwork details:
Touch the Teamwork-mode icon.
The teamwork dialog opens displaying the teamwork mode, number of units in stand-by, and number of
operating units.
NOTE: You must be logged-in with the Service PIN to edit teamwork mode. See Powering-on iCOM and
Logging-in/Unlocking Controls on page6.
Figure 2.2 Teamwork icons
Item Description
1 No teamwork.
2 Mode 1 - Parallelteamwork
3 Mode 2 - Independent teamwork
4 Mode 3 - Optimized aisle teamwork
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3 SERVICE OPERATION
3.1 Editing setpoints for the cooling unit
Setpoints are the means by which cooling-unit operation is controlled.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Setpoints options
Fan Control
See Configuring Fan Setpoints on page43.
High/Low Limit Control
See Configuring high/low-limit setpoints on page38.
Humidity Control
See Configuring humidity setpoints on page39.
Static Pressure Settings
See Configuring Static-pressure Setpoints on page47.
Temperature Control
See Configuring Temperature Setpoints below.
Temperature Compensation
See Setting temperature compensation on page37.
3.1.1 Configuring Temperature Setpoints
1. Touch , then > Setpoints > Temperature Control.
The TEMPERATURE CONTROL secondary panel opens.
2. Refer to Temperature Control options on the next page, Temperature Control –
TemperatureSetpointsandCooling Operation on page26,” and Compressor Control by
Cooling Requirement on page28” to adjust the setpoint options, then touch Save.
The setpoint is updated.
NOTE: Proportional-band setting is dependent on the heat load and the components specific to your
cooling unit. Additional tuning may be required after start-up when using PI temperature control. See
Considerations when Using PI Temperature Control on page28.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
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Temperature Control options
AutoSet Enabled
When enabled, the proportional band for temperature and humidity and both integration time
factors are set automatically based on the type of cooling unit (single-compressor, dual-compressor
or chilled-water).
NOTE: General settings cannot be adjusted or changed when AutoSet is enabled. If you make a change
when AutoSet is enabled, the parameter defaults back to its original setting.
BMS Backup Temp Setpoint
Temperature that the cooling unit maintains during BMS back-up operation.
Dehumidification Reheat Proportional Band
Sets reheat operation independently from the Temperature Proportional band. Adjusts the
activation point of dehumidification components based on deviation of the selected
Dehumidification Reheat Temp Control sensor and the Dehumidification Reheat setpoint by placing
half of the selected value on each side of the setpoint. A smaller number causes faster reaction to
temperature changes.
Dehumidification Reheat Setpoint
Temperature that the unit maintains via dehumidification reheat.
Dehumidification Reheat Temp Control Sensor
Selects the sensor that controls dehumidification reheat. Values are:
• SUP = Temperature control is based on maintaining the temperature of the discharge air from
the cooling unit. See Supply Sensors on page118.
• REM = Temperature control is based on the temperature reading(s) from wired remote/rack
sensor(s). See Wired Remote Sensors on page116.
• RET = Temperature control is based on maintaining the temperature of the room air.
Heater Deadband
Widens the setpoint to prevent small temperature changes from cycling re-heat components.
Temperature Control Sensor
Selects sensor that controls cooling. Values are:
• Supply Sensor = Temperature control is based on maintaining the temperature of the
discharge air from the cooling unit. See Supply Sensors on page118.
• Remote Sensor = Temperature control is based on the temperature reading(s) from wired
remote/rack sensor(s). See Wired Remote Sensors on page116.
• Return Sensor = Temperature control is based on maintaining the temperature of the room air.
• Customer-input setpoint (remote-alarm device)
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Temperature Control Type
Control when staging cooling and heating operations. Valid values:
• Proportional = percent of cooling/heating determined by the difference between the airtemperature sensor reading and the temperature setpoint.
• PI = percent of cooling/heating calculated using the temperature proportional band and
temperature-integration time settings. See Considerations when Using PI Temperature Control
on page28.
• Adaptive PID = Auto-tuning PID control loop, can be set for Cooling. Only available on Liebert®
CW (chilled-water) systems.
• Intelligent = percent of cooling/heating determined by programmed logic that simulates
manual human control.
Temperature Deadband
Widens the setpoint to prevent small temperature changes from cycling compressors and valves
maximizing component life. When temperature is within the deadband, no change of the control
output (heating/cooling) occurs.
Temperature Integration Time
Adjusts amount of cooling/heating based on the length of time the temperature has deviated from
the setpoint. The time selected is the amount of time it will take cooling capacity to reach 100%. For
example, if 3 minutes is selected, cooling capacity will increase to 100% in 3 minutes.
NOTE: 3 to 5 minutes of integration time is adequate for most applications. See Considerations when
Using PI Temperature Control on page28.
NOTE: Only used when Temperature Control Type is PI.
Temperature Proportional Band
Adjusts the activation point of cooling/heating components based on deviation from setpoint by
placing half of the selected value on each side of the temperature-control setpoint. A smaller
number causes faster reaction to temperature changes.
NOTE: Setting this too low causes short-cycling of compressors.
Temperature Setpoint
Temperature that the unit maintains via cooling/reheat.
Temperature Setpoint Act
Read-only display of adjusted temperature setpoint when one of the following is active:
• Temperature compensation
• BMS back-up temperature setpoint
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3.1.2 Temperature Control –TemperatureSetpointsandCooling Operation
Temperature control refers to the cooling unit’s response to programmed setpoints and sensed room/load
conditions. Temperature control is closely-tied to the primary cooling source. Liebert® Thermalmangement units employ several types of primary cooling sources:
Compressor operation
iCOM controls the cooling units based on a calculated need for cooling (and heating, if included on your
system). The requirement is expressed as a percentage (%) and is calculated using the selected
temperature-control type.
Temperature proportional band
Use the proportional and dead-band parameters to control how your cooling unit(s) respond based on
the calculated need for cooling (or heating). Figure 3.1 below, illustrates temperature control using:
• 70° setpoint
• 10° proportional band
• No dead band
The proportional band is divided evenly on each side of the setpoint.
• 0% cooling capacity is required at 70°.
• As the air temperature increases, cooling also increases along the proportional band.
• Ifthe air temperature reaches 75°, the system operates at 100% cooling capacity.
• If air temperature rises to the end of the proportional band or further, the system operates at
100% capacity to bring the temperature down to the setpoint.
• If your unit includes reheat, the heating capacity operates in the same way as the air
temperature falls below the setpoint. See Reheat Control on page57.
Figure 3.1 Temperature control without a dead band
No. Description
1 ½of proportionalband.
2 ½ of proportional band.
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Temperature deadband
A dead band widens the setpoint to prevent small temperature changes from activating compressors and
valves and cause excessive component cycling. Figure 3.2 below, illustrates temperature control using:
• 70° setpoint
• 10° proportional band
• 2° dead band
Like the proportional band, the dead band is also divided evenly on each side of the setpoint.
• 0% cooling capacity is required from 69° to 71°.
• At 71°, the system operates according to the temperature proportional band.
Figure 3.2 Temperature control with a dead band
3 Service Operation
No. Description
1 ½of proportionalband.
2 ½ of proportional band.
3 Deadband.
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Considerations when Using PI Temperature Control
Several factors, such as room heat load, external heat gains, and component-specific performance can
affect the PI control loop. Adjusting the temperature proportional band and integration time can improve
cooling-unit performance and avoid problems detailed in Table 3.1 below.
Table 3.1 PI temperature-control troubleshooting
Problem Solution
Coolingis slow to activate
Compressor short-cycle
alarm
Excessive valve oscillation
or hunting
Dec rease the proportionalbandslightly and monitor operation.
Repeat until cooling-reaction time is acceptable.
Increase the proportional band slightlyby increasing the integration time between 3 and 5 minutes, and
monitor compressor run time.
Set the temperature deadband to 2.
Run time must be more than3 minutes to prevent ashort-cycle of the compressor.
Increase the proportional band and/or increase integration time.
3.1.3 Compressor Control by Cooling Requirement
Compressor control is directly-linked to temperature control in that the cooling requirement determined
by the temperature proportional band determines compressor operation. Depending on the type of
cooling unit, the number and type of compressors varies. The following describes compressor operation
along the proportional band for the varying compressor options.
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One scroll compressor without unloaders
• 70° setpoint
• 8° proportional band
• 2° dead band
In Figure 3.3 below:
The compressor starts at 75° when the cooling requirement is 100% and continues to operate until 71° is
reached when cooling requirement is 0%.
Figure 3.3 Compressor control—1-step capacity
3 Service Operation
No. Description
1 Single scroll compressor.
2 ½ of proportional band.
3 Deadband.
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Two scroll compressors without unloaders
• 70° setpoint
• 8° proportional band
• 2° dead band
In Figure 3.4 below:
Compressor1 starts at 73° when the cooling requirement is 50% and continues to operate until 71° is
reached when cooling requirement is 0%.
Compressor2 starts at 75° when the cooling requirement is 100% and continues to operate until 73° is
reached when cooling requirement is 50%.
Figure 3.4 Compressor control—2-step capacity using 2 scroll compressors without unloaders
30
Number Description
1 Scroll compressor 1.
2 Scroll compressor 2.
3 ½ of proportional band.
4 Deadband.
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One scroll compressor with unloader
• 70° setpoint
• 8° proportional band
• 2° dead band
In Figure 3.5 below:
The compressor starts un-loaded at 73° when the cooling requirement is 50%.
At 75° when the cooling requirement is 100%, the compressor operates loaded until 73° is reached when
cooling requirement is 50% and it returns to un-loaded operation.
Figure 3.5 Compressor control—2-step capacity using 1 scroll compressor with unloaders
3 Service Operation
Number Description
1 Scroll compressor unloaded.
2 Scroll compressor loaded.
3 ½ of proportional band.
4 Deadband.
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Two scroll compressors with unloaders
• 70° setpoint
• 8° proportional band
• 2° dead band
In Figure 3.6 below:
Compressor 1 starts unloaded when the cooling requirement is 33% and continues to operate until the
cooling requirement is 17% or, if the cooling requirement reaches 80%, Compressor 1 operates loaded until
the requirement is 70%.
Compressor 2 starts unloaded when the cooling requirement is 63% and continues to operate until the
cooling requirement is 47% or, if the cooling requirement reaches 100%, Compressor 2 operates loaded
until the requirement is 90%.
Figure 3.6 Compressor control—4-step capacity
No. Descr iption No. Descr iption
1 Step 1: Compressor 1 starts unloaded. 4 Step 4: Compressors 1 and 2 operate loaded.
2 Step 2: Compressor 2 starts unloaded. 5 ½ of proportional band.
3
32
Step 3: Compressor 1 operates loaded andcompressor
2 operates unloaded.
6 Deadband.
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Digital-scroll Compressors
Digital scroll compressors use time loaded/un-loaded to modulate cooling capacity between 10% and
100% to control cooling more precisely than non-digital compressors. Capacity modulation is achieved by
opening and closing a digital solenoid valve in 15-second intervals while the compressor runs
continuously when the cooling requirement is 10% to 100%.
• When the valve is opened (energized, the compressor is un-loaded and capacity is 0%
(because the scroll plates are separated so that there is no refrigerant flowing through the
compressor).
• When the valve is closed (de-energized), the compressor is loaded and capacity is 100%.
• Capacity is determined by the amount of time that the valve is closed in the 15-second interval.
Figure 3.7 below illustrates solenoid-valve operation when cooling requirement is 66%.
• The valve is closed for 10 seconds (100% cooling),
• then open for 5 seconds (0% cooling),
• which results in 66% cooling. Essentially, the compressor is “partially-loaded.”
Figure 3.7 Digital-scroll compressor operation to provide 66% cooling capacity
3 Service Operation
No. Description
1 Solenoid de-energized.
2 Solenoid energized.
3 Perc ent loaded.
4 15-second capacity modulation cycle.
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One digital-scroll compressor
In a single digital-scroll system:
• The compressor starts when the cooling demand is at least 25% (calculated from temperature
proportional band) and operates at 50% capacity (valve open 7.5sec/closed 7.5sec) for an
initial period set in Winter Start Delay, see Setting Low-pressure Time Delay on page55, after
which it operates per cooling demand.
• As cooling demand increases, the length of time the valve is closed increases/capacity
increases.
• At 100% cooling requirement, the valve remains closed for the entire 15-second interval and
the compressor is operating loaded at 100% capacity.
• The compressor stops when cooling demand decreases to 10%.
Figure 3.8 on the facing page illustrates digital-scroll compressor operation with the following setpoint
parameters:
• 70° setpoint
• 8° proportional band
• 2° dead band
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Figure 3.8 Compressor control—Single digital-scroll compressor
No. Description
1 Digital-scroll begins operation.
2 Digital-scrolloperation at 100%
3 ½ of proportional band.
4 Deadband
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Dual digital-scroll compressors
In a two digital-scroll system, the compressors operate in a lead-lag configuration:
• The lead compressor starts when the cooling demand is at least 25% (calculated from
temperature proportional band) and operates at 50% capacity (valve open 7.5sec/closed
7.5sec) for an initial period set in Winter Start Delay, see Setting Low-pressure Time Delay on
page55, after which it operates per cooling demand..
• The lag compressor starts when cooling demand is 35% and operates at 70% capacity,
increasing capacity as cooling demand increases.
• On both compressors at 100% cooling requirement, the valve remains closed for the entire 15second interval and the compressors operate loaded at 100% capacity.
• The lag compressor stops when the cooling demand decreases to 20%.
• The lead compressor stops when cooling demand decreases to 10%.
Figure 3.9 on the facing page illustrates digital-scroll compressor operation with the following setpoint
parameters:
• 70° setpoint
• 8° proportional band
• 2° dead band
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Figure 3.9 Compressor control—Dual digital-scroll compressor
No. Description
1 Lead compressor.
2 Lagcompressor.
3 Lead and lag compressors.
4 ½of proportionalband.
5 Deadband
3.1.4 Setting temperature compensation
Temperature compensation provides protection from changes that affect capacity and heat load by
monitoring temperature conditions and fan-speed settings, then automatically adjusting the temperature
setpoint. Changes that may cause temperature compensation are floor-tile removal in non-cold-aisle
areas, incorrect supply-temperature setpoint, unit failure in a neighboring zone, or un-expected heat-load
fluctuations at rack equipment.
Temperature compensation is also tied-in to cascade/stand-by operation in Teamwork Mode 3. See
Teamwork Mode3—Optimized-aisle Operation on page96.
1. Touch , then > Setpoints >Temperature Compensation.
The TEMPERATURE COMPENSATION secondary panel opens.
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2. Select the Compensation Type, then touch Save.
The setpoint is updated.
• Return-temperature compensation cannot be used when both fan- and cooling-control is
set to “Return.”
• Supply-temperature compensation requires the following settings:
Temperature Control Sensor = Supply Sensor
Fan Control Sensor = Remote Sensor
NOTE: When temperature compensation is enabled and active, the “Temperature Setpoint Act” field on
the Temperature Control setpoints panel displays the adjusted setpoint value.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Temperature Compensation options
Compensation Type
Selects the compensation routine:
• No = Temperature compensation routine disabled.
• Return = Increases the temperature setpoint when the return-air temperature is too cold.
• Supply = Decreases the temperature setpoint when the air-flow capacity approaches 100%
and the cold-aisle temperature remains above the setpoint.
• Supply+Return = Allows both supply and return compensation.
3.1.5 Configuring high/low-limit setpoints
Setting dehumidification low limits avoids over-cooling a room during dehumidification. When a low limit is
reached, the cooling source used for dehumidification is disabled. Dehumidification resumes when air
temperature rises above the low-limit reset value.
NOTE: Dehumidification lock-out can occur with improper low-limit settings. To avoid lock-out,
increase heat load for efficient operation, decrease low-limit settings slightly, and where applicable,
decrease the reheat proportional band to allow reheat sooner.
To set high and low limits:
1. Touch , then > Setpoints > High/Low Limit Control.
The HIGH/LOW LIMIT CONTROL secondary panel opens.
2. Adjust the setpoint options, then touch Save.
The setpoint is updated.
• Touch Cancel to discard the changes.
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NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
High/Low-limit Control options
Dehum Low Limit X
Temperature at which dehumidification is interrupted. Where X is limit 1 or 2.
Dehumidification Low Limit Sensor
Selects the sensor that is used for the low-limit determination.
Dehumidification Low Limit Setpoint
Temperature below which dehumidification is disabled.
High Return Limit
Enables/Disables use of additional fan speed based on return-air temperature.
Return Limit P-band
Calculates fan speed based on proportional deviation from the return-air temperature.
Supply Limit Enabled
Enables/Disables use of additional fan speed based on supply-air temperature.
Supply Temp Limit Setpoint
Supply-air temperature at which use of additional fan speed is enabled.
3.1.6 Configuring humidity setpoints
1. Touch , then > Setpoints > Humidity Control.
The HUMIDITY CONTROL secondary panel opens.
2. Refer to Humidity Control options below and Humidity Control on page41 to adjust the
setpoint options, then touch Save.
The setpoint is updated.
• Touch Cancel to discard the changes.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Humidity Control options
Control Dewpoint
Dewpoint setpoint.
Dewpoint Deadband
Widens the setpoint to prevent small changes from cycling compressors and valves maximizing
component life. When temperature is within the deadband, no change of the control output
(humidification) occurs.
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Dewpoint P-band
Adjusts the activation point of humidifier/dehumidification components based on deviation from
setpoint by placing half of the selected value on each side of the dewpoint setpoint. A smaller
number causes faster reaction to humidity changes.
Dewpoint Setpoint
Humidity level (based on actual return-air temperature and humidity) by adding moisture to or
removing moisture from the air.
Humidity Control Sensor
Selects sensor used when calculating relative humidity.
Humidity Control Type
Controls humidification/dehumidification operation. Valid values:
• Proportional = percent of humidification/dehumidification determined by the difference
between the humidity sensor reading and the humidity setpoint.
• Dew Point = percent of humidification/dehumidification determined using the measured
return temperature and humidity to calculate the dew point and comparing it to the setpoints.
NOTE: When dew point is selected, the humidity setpoint and proportional band units are degreesdewpoint.
• Relative = percent of humidification/dehumidification determined using the measured
humidity content of the air to calculate the percent relative humidity (RH) and comparing it to
the setpoints.
NOTE: Relative humidity control can cause unnecessary humidification/dehumidification from overcooling based on a higher-than-normal RH reading that causes extended dehumidification, which in
turn causes a low RH reading that activates the humidifier.
• Compensated = percent of humidification/dehumidification determined using the measured
humidity content of the air and automatically adjusting the humidity setpoint.
NOTE: Compensated humidity control prevents un-necessary humidification/dehumidification noted
with relative humidity control.
• Predictive = percent of humidification/dehumidification determined using the measured
humidity content of the air and automatically adjusting the humidity-sensor reading.
Humidity Deadband
Widens the setpoint to prevent small changes in humidity from cycling components and also
maximizes component life. When humidity is within the deadband, no
humidification/dehumidification occurs.
Humidity Integration Time
Adjusts unit capacity based on the length of time the humidity has deviated from the setpoint.
Works in conjunction with the proportional band to maintain tight setpoint control.
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Humidity Proportional Band
Adjusts the activation point of humidifier/dehumidification components based on deviation from
setpoint by placing half of the selected value on each side of the humidity-control setpoint. A smaller
number causes faster reaction to humidity changes.
Humidity Setpoint
Humidity level by adding moisture to or removing moisture from the air.
Humidity Setpoint 2
Alternate setpoint activated by customer input (remote-alarm device/RAD). When customer input
connection = 2nd Setpoint, this value becomes the active humidity setpoint.
3.1.7 Humidity Control
Humidity control refers to the cooling unit’s response to programmed setpoints and sensed humidity
conditions.
iCOM controls humidity based on temperature and humidity sensor readings. The requirement is
expressed as a percentage (%) and is calculated using the selected humidity-control type.
Humidity proportional band
Use the proportional and dead-band parameters to control how your cooling unit(s) respond based on
the calculated need for humidification/dehumidification. As the return-air humidity deviates from the
humidity setpoint, iCOM responds with a humidification or dehumidification capacity of 0% to 100% in
1%increments.
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Figure 3.10 below, illustrates humidity control using:
• 50% setpoint
• 8% proportional band
• No dead band
The proportional band is divided evenly on each side of the setpoint.
• 0% humidifying capacity is required at the humidity setpoint.
• The humidifier starts operating when the humidification requirement reaches 100% and
continues to operate until the humidification requirement drops to 0%. During this period, the
display shows 100% humidification
• The dehumidifying capacity responds in the same way as the return-air humidity rises above
the setpoint. Dehumidification is accomplished by a request for cooling that activates as soon
as the required dehumidifying capacity reaches 100% and continues operating until the
required dehumidifying capacity drops to 0%. During this period, the digital compressor
loading scales between a minimum percentage (Advanced setting: A557) and 100% depending
upon required dehumidifying capacity. The display always shows 100% dehumidification.
Figure 3.10 Humidity control without a dead band
No. Description
1 ½of proportionalband.
2 ½ of proportional band.
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Humidity deadband
A dead band widens the setpoint to prevent small changes in humidity from activating humidifiers,
compressors and valves and cause excessive component cycling.
Figure 3.11 below, illustrates humidity control using:
• 50% setpoint
• 8% proportional band
• 2% dead band
Like the proportional band, the dead band is also divided evenly on each side of the setpoint.
• 0% cooling capacity is required from 49% to 51%.
• Below 49%, humidification operates according to the humidity proportional band.
• Above 51%, dehumidification operates according to the humidity proportional band.
Figure 3.11 Humidity control with a dead band
3.1.8 Configuring Fan Setpoints
Configures fan-speed control to operate independent of compressor loading (de-coupled mode).
3 Service Operation
No. Description
1 ½of proportionalband.
2 ½ of proportional band.
3 Deadband.
1. Touch , then > Setpoints > Fan Control.
The FAN CONTROL secondary panel opens.
2. Adjust the setpoint options, then touch Save.
The setpoint is updated.
• Touch Cancel to discard the changes.
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NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Fan Control options
Airflow Calibration
Maximum allowed fan output voltage.
Fan Control Sensor
Selects the sensor that controls automatic fan-speed, see Automatic Fan-speed Control on page46,
– or –
Selects manual control, see Manual Fan-speed Control on the facing page.
Options are:
• Supply = Air flow/fan speed is adjusted based on reading from the supply air-temperature
sensor.
• Remote = Air flow/fan speed is adjusted based on reading from a wired, remote temperature
sensor.
• Return = Air flow/fan speed is adjusted based on reading from the wired, return airtemperature sensor.
• Manual = Air flow/fan speed is adjusted using a building-management system.
Fan Control Type
Selects the method of control for the fan motor.
• Auto = Air flow/fan speed is adjusted using locally-installed temperature sensors.
• Proportional = regulation based on the difference between the fan-control sensor reading and
the fan setpoint.
• PI = regulation is based on proportional and integral terms. Provides best temperature control
and helps avoid fan-speed oscillation.
• Adaptive PID = Auto-tuning PID control loop, can be set for Cooling or Fanspeed.
Fan Delta
Fan temperature setpoint, it is the temperature difference compared to the cooling setpoint.
Fan Speed Proportional Band
Adjusts the fan speed based on the deviation from the setpoint. A smaller number causes faster
reaction to temperature changes.
Fan Speed Integration
Adjusts fan speed based on time away from the setpoint to maintain accurate temperature control.
Maximum Fanspeed
Maximum percentage at which the fans will operate.
Minimum Fanspeed
Minimum percentage at which the fans will operate.
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Static Pressure Deadband
Widens the setpoint to prevent small changes in static pressure from cycling the fan speed. When
static-pressure reading is within the deadband, no change in fan speed occurs
Static Pressure Fan Control
Fan speed is controlled based on the static-pressure setpoint and the static-pressure reading from
the sensor.
Static Pressure Fanspeed P-band
Proportional band adjusts fan-speed activation point based on a deviation from setpoint by placing
half of the selected value on either side of the fan-speed control setpoint. A smaller number causes a
faster reaction in fan speed.
Static Pressure Lower Range
Minimum threshold for static pressure. Defines the low end of the static-pressure range.
Static Pressure Setpoint
Static pressure that the unit maintains via fan-speed. Expressed in inWC or Pa, depending on unitof-measurement selected.
Static Pressure Upper Range
Maximum threshold for static pressure. Defines the high end of the static-pressure range.
3.1.9 Manual Fan-speed Control
In Manual fan-control mode, the speed of the motor can be set in one of the following ways:
• The manual (fixed) fan speed may be set via iCOM.
• Hard-wired analog input (input-signal types including 4to 20mA, 0 to 10VDC, and 0to5VDC)
and a factory-suppled isolator to ensure reliable communication.
• Remotely using a Liebert® IntelliSlot® card.
Setting Manual Fan-speed Control via Analog Input
1. Touch , then > Setpoints > Fan Control, set Fan Control Sensor to Manual, then
touch Save.
2. Touch , then > Auxiliary Device Setup > Analog Input.
3. On ANALOG INPUTS, touch Customer Analog Inputs to expand it, then touch the analoginput device corresponding to fan-speed control.
4. On the ANALOG INPUT PROPERTIES panel, adjust the properties, then touch Save.
• Touch Cancel to discard the changes without saving.
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Setting Manual Fan-speed Control via BMS System
1. Touch , then > Setpoints > Fan Control, set Fan Control Type to Manual, then touch
Save.
2. Touch , then > BMS & Teamwork Setup > BMS Setup.
3. On BMS SETUP, touch Control Settings.
The CONTROL SETTINGS sencondary panel displays:
• In Fan Control Sensor, select Manual.
• In BMS Fan Speed Local Override, select No.
• Touch Save.
BMS control of fan speed is set, and the BMS-set fan speed is displayed on the Fan Speed
slider.
NOTE: Set the fan speed via BMS by writing to the Fan Speed Maximum Set Point monitoring point. For
details, see SL-28170 IntelliSlot Reference Guide found at https://www.vertivco.com/en-us/support/.
NOTE: Local adjustments to fan speed are overridden when remote/BMS fan-speed control is set.
3.1.10 Automatic Fan-speed Control
Temperature sensors can control fan-speed using one of three modes based on the type of sensor
selected as the fan-control sensor: supply, return, or remote, see Table 3.2 below. Control is based on the
selected sensor for both fan control and temperature control and their setpoints as follows:
• Coupled—the fan-control and temperature-control sensor selection is the same. When
coupled, fan speed is determined by the temperature setpoints.
• Decoupled—the fan-control and temperature-control sensor selection is different. When
decoupled, fan speed is determined by the fan setpoints.
Table 3.2 Fan-speed controlling sensor options
Temperature Control S ensor selected
Supply Sensor Remote S ensor Return Sensor
Supply Sensor Coupled N/A N/A
Fan Control Sensor selected
Remote Sensor Decoupled (Recommended) Coupled N/A
Return Sensor Decoupled Dec oupled Coupled
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To set parameters for automatic fan-speed control:
1. Touch , then > Setpoints > Fan Control,
• Set Fan Control Type to Manual
• Select a Fan Control Sensor.
• Adjust the setpoint options, then touch Save.
Sensor-based fan-speed control is set.
2. Touch Temperature Control.
3. On the TEMPERATURE CONTROL secondary panel:
• Select a Temperature Control Sensor.
• Adjust the setpoint options, then touch Save.
3.1.11 Configuring Static-pressure Setpoints
1. Touch , then > Setpoints > Static Pressure Settings.
The STATIC PRESSURE SETTINGS secondary panel opens.
2. Adjust the setpoint options described in the Static Pressure Settings options below, then
touch Save.
The setpoint is updated.
• Touch Cancel to discard the changes.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Static Pressure Settings options
Current Override Temperature
Current temperature reading of the sensor selected for static-pressure control override.
Current Override Value
Percentage of override from 0% (no override/static-pressure control only) to 100% (temperaturesensor reading overrides completely).
Full Speed at
Temperature at which override reaches 100% and fan operates at full speed.
Operation at Static Pressure Sensor Failure
Selects operation in the event that the static-pressure sensor fails. Values are:
• Freeze Speed = Current fan speed is kept.
• SP Off = Static-pressure control is disabled and fan speed is dictated by selected fan-speed
sensor.
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Override Integration Time
Adjusts amount of override based on the length of time the temperature has deviated from the
setpoint.
Override Slew Rate Filter
Rate-of-change filter to slow-down fan-speed changes.
Static Pressure Control Override
Selects sensor that may override static-pressure control if the temperature gets too far from the
temperature setpoint to provide additional air flow because static pressure is not able to maintain
the temperature. Values are:
• None = Override is disabled.
• Remote Sensor = the remote sensor overrides static-pressure control.
• Return Sensor = the return sensor overrides static-pressure control.
Static Pressure Min Pause
Minimum initial length of time that fan-speed stops increasing after the pressure reading crosses
into the deadband. After the pause, the fan speed pulses (increases if below the setpoint and
decreases if above the setpoint) for the period selected in the Static Pressure Pulse inside deadband
field. After each pulse, a pause takes place, the length of which is calculated as a ratio between the
deadband border (minumum) and the setpoint (maximum).
Static Pressure Max Pause
Maximum initial length of time that fan-speed stops increasing after the pressure reading crosses
into the deadband. After the pause, the fan speed pulses (increases if below the setpoint and
decreases if above the setpoint) for the period selected in the Static Pressure Pulse inside deadband
field. After each pulse, a pause takes place, the length of which is calculated as a ratio between the
deadband border (minumum) and the setpoint (maximum).
Static Pressure Pulse inside deadband
Period of time the fan speed increases or decreases (pulses) when pressure is inside the deadband.
Static Pressure Requested Speed Up to
Temperature at which static-pressure-control override begins.
3.2 Scheduling Condenser and Cooling-unit Tasks
The Scheduler configures operating conditions and modes for specific intervals. Tasks to schedule
include:
• Condenser set-back—see Scheduling Condenser Low-noise Operation on the facing page.
• Condenser fan-reversal—see Scheduling Condenser-fan Reversal on page50.
• Unit sleep Schedule—Turns-off units during times of low demand and controlled only by
temperature. Sleep is interrupted if the return temperature rises above the alarm threshold.
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3.2.1 Scheduling Condenser Low-noise Operation
Condenser setback schedules low-noise fan operation on units equipped with Liebert® MC premiumefficiency control. Fans spin more-slowly during specified times to reduce noise, and faster when low-noise
is unnecessary.
NOTE: Low-noise operation is overridden to prevent a high-pressure condition.
1. Touch , then > Scheduler > Condenser Setback Schedule.
The TASK PROPERTIES panel opens.
2. Adjust the schedule settings, and touch Save.
The schedule is set up.
• Touch Cancel to discard the changes.
Condenser Setback Task-properties options
Disabled Day
Selects specific days on which noise-reduction operation is disabled when the schedule is enabled.
Interval 1
Start and finish time of day that noise-reduction operates.
Interval Day
Selects days on which noise-reduction operation for the interval specified in Interval 1.
Max Speed in Low Noise Mode
Sets the maximum speed for the condenser fan during low-noise operation.
Max Speed in Normal Mode
Sets the maximum speed for the condenser fan during normal or high-efficiency operation.
Noise Reduction
Enable/Disable noise reduction. When checked, the schedule is run. When un-checked, the
scheduling parameters are ignored.
Status
Indicates if low-noise operation is active or inactive.
Whole Day
Selects whole days for which noise-reduction operation is available for the condenser fan.
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3.2.2 Scheduling Condenser-fan Reversal
Condenser-fan reversal schedules a reversal of the condenser fans, reversing air flow to help remove dust,
paper, leaves and such from the suction side of the condenser coil.
1. Touch , then > Scheduler > Condenser Fan Reversal Schedule.
The TASK PROPERTIES panel opens.
2. Adjust the schedule settings, and touch Save.
The schedule is set up.
• Touch Cancel to discard the changes.
Condenser Fan-reversal Task-properties options
Reverse Fans At Duration
Length of time, in seconds, the fans are reversed.
Reverse Fans Every
Selects number of days between fan reversal.
Reverse Fans Now
Enables/Disables immediate fan reversal.
3.2.3 Scheduling “Sleep” Times for Thermal-management Units
Unit sleep schedules turn-off units during low-demand as long as return temperature remains below the
alarm threshold.
1. Touch , then > Scheduler > Unit Sleep Schedule.
The TASK PROPERTIES panel opens.
2. Adjust the schedule settings, and touch Save.
The schedule is set up.
• Touch Cancel to discard the changes.
Unit Sleep Schedule Task-properties options
Interval 1/2
Start and finish time of day that sleep mode operates.
Interval Day
Selects days on which sleep mode operates for the intervals specified in Interval 1 and Interval 2.
Sleep Mode
Enable/Disable sleep schedule. When checked, the schedule is run. When un-checked, the
scheduling parameters are ignored.
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Timer Mode Type
Selects unit operation when in sleep mode. Values are:
• Unit Off = The unit stops (fans are off).
• Deadband = The unit operates in a limited capacity (fans are on) based on an additional
deadband added to the temperature deadband.
Timer Reset
Selects whether or not the sleep-mode timer resets.
Whole Day
Selects specific days on which sleep mode is active for the entire day when the schedule is enabled.
3.3 Setting General Thermal-management Unit Options
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
3.3.1 Setting Miscellaneous Options
1. Touch , then > Options Setup > Misc Settings.
The MISC SETTINGS panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Miscellaneous cooling-unit settings options
Auto Restart Enable
When enabled, the cooling unit returns to the status at which it was operating when input power
returns after a power failure. (“On” if it was powered-on and “Off” if it was powered-off before the
failure.) See Automatic Restart after Power Failure on the next page.
Cascade after Remote On
Upon a remote request for all units to start, selects whether or not the units start one after another
by the Cascade Units Delay set in Teamwork Modes on page93, see the Teamwork Control options
on page94.
Freecool Capacity Transition Filter
Selects how quickly capacity changes between modes of operation to avoid overshooting during the
transition.
• Only a factory-trained service technician should adjust this setting.
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K11 Active on
Selects the action of the activated K11 (warning) relay. Options are:
• Dehum = dehumidification is on.
• Warning = a warning is active.
• Emergency Pwr = emergency power is on.
• Freecooling = Freecooling is on.
• FC Start = Freecooling is in the start phase or is on.
Loss of Power Autoreset Delay
Selects the length of time that “Loss of Power” event (that triggers after a power cycle that occurs
when the cooling unit is operating) is active when power is restored. When the delay time elapses,
the event resets and is cleared automatically.
Operation at Temp Control Sensor Failure
Selects cooling-unit operation in the event that the control temperature sensor fails.
• Shut Down = the unit shuts down on sensor failure.
• Cooling = the unit continues operation based on the select Temp Control Sensor Failure
Cooling Mode.
Single Unit Auto Restart
Selects time elapsed (in seconds) before unit restarts when Auto Restart Enable is enabled.
Temp Control Sensor Failure Cooling Mode
Unit operation when “Cooling” is selected at control temperature sensor failure.
• Hold = holds the last call for cooling. That is, continue operating at same capacity.
• Full = activates full cooling, 100% capacity.
Warning Activates Alarm Relay
When enabled, a warning event activates the common alarm relay.
3.3.2 Automatic Restart after Power Failure
Set the cooling unit to return to the status at which it was operating when input power returns after a
power failure. (“On” if it was powered-on and “Off” if it was powered-off before the failure.)
1. Touch , then > Options Setup > Misc Settings.
The MISC SETTINGS panel displays.
2. Set Auto Restart Enable to Yes, and use the slider to set the number of seconds to delay before
restart, then touchSave.
Automatic restart is enabled.
• Touch Cancel to discard the changes without saving.
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3.3.3 Setting Fan Options
Air flow is adjustable via iCOM manually using a building-management system (BMS) or automatically
using locally-installed temperature sensors.
NOTE: Thermal-management units ship with the factory setting “Return Sensor” for the temperaturecontrol sensor and the fan-speed-control sensor.
1. Touch , then > Options Setup > Fan Settings.
The FAN SETTINGS panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Fan Settings options
Airflow Calibration
Maximum allowed fan output voltage.
Allow Fan Modulation with Comp
Enables/Disables fan modulation with compressor operation. Values are:
No = Fan speed ramps to STD when a compressor starts operating.
Yes = Fan speed modulates based on CFF while compressor operates.
Dehumidification Fanspeed
Maximum fan speed when dehumidification is in progress, assisting with the dehumidification
process.
Fan Backdraft Mode
Enables/Disables fan operation in back-draft mode.
Fan Shutdown Delay Timer
Length of time that the fan continues to operate after the cooling unit is turned-off via the display,
local control or the BMS.
• The delay timer does not apply when the unit is turned-off remotely.
Fanspeed at Unit Start
Speed at which the fans run on unit start up.
Fanspeed at Unit Start Timer
Length of time fans run at the speed selected in Fanspeed at unit start.
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Fanspeed Filter at 0%
Decreases the rate at which the fan speed changes when close-to or at the temperature setpoint to
avoid undershooting the setpoint.
Fanspeed Filter at 100%
Increases the rate at which the fan speed changes for a quicker reaction of fan speed at high
temperatures.
Fanspeed Reposition Delay
Length of time before fan speed can decrease, allowing temperature to stabilize before the change
occurs.
Fanspeed Reposition Mode
Sets a one-time delay that allows the fan to maintain current speed when a call to increase or
decrease is made to allow the temperature to stabilize.
Fanspeed Transition Filter
Sets how quickly the fan speed changes between operating modes. Prevents an instant reaction
when fans turn on or off and prevents unstable operation.
Max Deceleration Rate
Selects the rate and which the fan speed changes during deceleration.
Maximum Fanspeed
Maximum speed at which the fan will operate.
MIN at CFC for EC Fan
Cooling deviation at which the fan will operate at minimum speed.
Minimum Fanspeed
Minimum speed at which the fan will operate.
No Power Fanspeed
Speed at which the fans operate when using emergency power.
STD at CFC for EC Fan
Cooling deviation at which the fan will operate at maximum speed.
3.3.4 Setting Compressor Options
1. Touch , then > Options Setup > Compressor Settings.
The COMPRESSOR SETTINGS panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
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NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Compressor Settings options
Ball Valve Setpoint Offset
Adjusts sensitivity to compressor discharge pressure or liquid pressure by increasing sensitivity.
The higher the added pressure, the more the valve opens.
Capacity Change at 0%
Decreases the rate at which cooling capacity changes when close-to or at the temperature setpoint
to avoid undershooting the setpoint.
Capacity Change at 100%
Increases the rate at which the cooling capacity changes for a quicker reaction of cooling at high
temperatures.
Compressor Sequence
Selects the lead compressor when cooling activates. Values are:
• Auto = Compressor with the lowest run hours leads.
• 1 = Compressor 1 leads.
• 2 = Compressor 2 leads.
Winter Start Delay
Length of time, in minutes, that a low-pressure condition is ignored during compressor start-up. See
Setting Low-pressure Time Delay below.
Setting Low-pressure Time Delay
At compressor start-up, a low-pressure condition is ignored for a set period to avoid false trips due to
bubbles in the refrigerant or other misreading of the low-pressure device.
NOTE: The factory-default setting is a 3-minute delay for air-cooled units and a 0- to 1-minute delay for
water-cooled units.
1. Touch , then > Options Setup > Compressor Settings.
2. Use the Winter Start Delay slider to select the number of minutes for the delay, and touch Save.
Adjusting Ball-valve Pressure Offset
NOTE: Only a properly-trained and qualified technician should modify the motorized ball valve setting.
The number of times the valve opens and closes is adjusted based on added pressure offset.
1. Touch , then > Options Setup > Compressor Settings.
2. Use the Ball Valve Setpoint Offset slider to select amount of pressure added to open the valve
wider, and touch Save.
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Compressor Sequencing for Balancing Run Times
Compressor sequencing, available in two-compressor cooling units, allows assigning a lead compressor or
allowing automatically leading with the compressor with the lower run-hours logged.
When “Auto” is selected, the following applies as iCOM attempts to maintain equal run-time of the
compressors:
• If only one compressor is available because of safety delays, it is given first priority to start/stop.
• If both compressors are “off,” the compressor with fewer run-hours in the next to start.
• If both compressors are operating, the compressor operating for the longest time since the last
start is the first to shut-off.
NOTE: Automatic compressor sequencing will not power-off a compressor if it is required to properly
condition the space.
To set-up compressor sequencing:
1. Touch , then > Options Setup > Compressor Settings.
2. Select the Compressor Sequence option to use, and touch Save.
3.3.5 Setting Reheat Options
If the room air temperature becomes too cold, heating is activated based on the temperatureproportional-band setting. Depending on the type of cooling unit, there are different types of reheat
(configured at purchase/set at factory). There may also be 1 to 3 stages of reheat, which is also factory set.
The only service operation available is setting the number of heat stages.
1. Touch , then > Options Setup > Reheat Settings.
The REHEAT SETTINGS panel displays.
2. Refer to Reheat Settings options below, and Reheat Control on the facing page to adjust the
setpoint options, then touchSave.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Reheat Settings options
Electric Heat Outputs
Shifts the output steps of the electric heaters.
Electric Heat Staging
Selects the number of stages available during reheat operation.
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Enable Hot Gas Heat
Enables/Disables hot-gas reheat. (May not be included on your cooling unit.) See Reheat Control
below. Values are:
• No = hot-gas reheat disabled.
• Comp.1 = use compressor 1.
• Comp.2 = use compressor 2
Enable Hot Water Flush
(steam canister) Selects the number of hours between hot-water-coil flush cycle.
Enable Hot Water Heat
Enables/Disables hot-water reheat. (May not be included on your cooling unit.)
Enable Rotation
Enables/Disables rotation of multiple heaters.
Hot Water Flush Duration
(steam canister)
Reheat Operation
Selects when heating is allowed.
• Dehum = Heating only allowed during dehumidification.
• Normal = Heating allowed during all operating modes.
SCR Control Type
Enables/Disables SCR reheat. (May not be included on your cooling unit.) See Reheat Control below.
Values are:
• None = SCR reheat disabled.
• Tight = use tight-control reheat mode.
• Standard = use standard reheat mode.
Electric Heat Stages
Number of electric stages that may be activated during reheat.
• Depending on your cooling unit, the maximum setting may be 1, 2, or 3.
3.3.6 Reheat Control
If your cooling unit(s) are equipped with a heating option, reheat control is directly linked to temperature
control in that the heating requirement determined by the temperature proportional band determines
reheat operation. See Temperature Control –TemperatureSetpointsandCooling Operation on page26.
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Electric, hot-gas and hot-water reheat
Depending on the type of cooling unit, there may be 1 to 3 stages of electric and hot-gas/hot-water
reheat. Table 3.3 below, shows the 9 electric reheat options.
Table 3.3 Electric, hot-gas and hot-water reheat
configurations
Type Stage 1 Stage 2 Stag e 3
A Electric 1 — —
B Electric 1 Electric 2 —
C Electric 1 Electric 2 Electric 3
D Hot gas — —
E Hot gas Electric 1 —
F Hot gas Electric 1 Electric 2
G Hot water — —
H Hot water Electric 1 —
I Hot water Electric 1 Electric 2
NOTE: During dehumidification, hot gas/hot water are not influenced by the electric reheat setting. Hot
gas is set only when the selected compressor is operating (See Enable Hot Gas Heat on the previous
page.)
Reheat is controlled by dividing the “heating” half of the temperature proportional band (below the
setpoint) by the number of stages. Figure 3.12 on the facing page, illustrates electric reheat operation
with 3 stages as follows:
• 70° setpoint
• 8° proportional band
• 2° dead band
• 3-stage reheat
The proportional band is divided evenly on each side of the setpoint. The dead band is divided evenly on
each side of the setpoint. The temperature proportional band below the setpoint is divided into thirds, one
for each stage.
• From 70° to 69°, 0% heating is required.
• At 68.7° air temperature (heating demand 33%), stage 1 activates and continues operating
until temperature reaches 69°.
• When temperature decreases to 67.4°(heating demand 66%), stage 2 activates, and continues
until temperature reaches 68.7° (heating demand 33%).
• When temperature decreases to 67.4°(heating demand 100%), stage 2 activates, and
continues until temperature reaches 68.7° (heating demand 66%).
• When temperature decreases to 63°(heating demand 100%), stage 3 activates, and continues
until temperature reaches 67.4° (heating demand 33%).
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Figure 3.12 Temperature control for reheat—3-stage electric reheat
No. Description No. Description
1 Stage 1 reheat. 4 ½of proportionalband.
2 Stage 2 reheat. 5 Deadband.
3 Stage 3 reheat.
SCR Reheat
SCR reheat uses pulsed on/off operation to modulate heating capacity to control temperature more
precisely than staged, electric reheat. 100% heating capacity is constant operation of SCR reheat. As the
temperature proportional band requires more heat, the SCR output adjusts proportionally.
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SCR reheat—Standard mode
NOTE: Standard SCR Reheat when used in conjunction with variable cooling capacity (such as chilled
water, variable-speed fans or digital-scroll compressors) provides ultimate capacity control and
energy-efficiency gains.
In standard mode, SCR reheat responds to a 0% to 100% heating requirement based on the temperature
proportional band. Figure 3.13 on the facing page, illustrates SCR reheat in standard mode as follows:
• 70° setpoint
• 8° proportional band
• No dead band
The proportional band is divided evenly on each side of the setpoint. The dead band is divided evenly on
each side of the setpoint.
• At 70° air temperature (heating demand 0%), no heating occurs.
• When temperature decreases below the setpoint, SCR reheat activates, and increases output
as the heating demand increases from 0% to 100%.
• As air temperature rises and heating demand decreases, the SCR reduces output and stops
operating when 70° (0% heading demand) is reached.
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Figure 3.13 Temperature control for reheat—SCR in standard mode
No. Description No. Description
1 SCR reheat operation. 5
SCR reheat stops/begins operating at the setpoint.
Compressor 1 begins/stops operation at the setpoint.
2 Compressor 1 operation. 6 Compressor 2 stops operating.
3 Compressor 2 operation. 7 Compressor 2 begins operating.
4 SCR reheat output is 100%. 8 ½ of proportionalband.
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SCR Reheat—Tight mode
In tight mode, cooling (compressors) and heating (SCR reheat) components operate simultaneously to
provide maximum temperature control.
NOTE: Tight mode is the factory-default setting when available. Tight mode is not available on chilledwater units, units with variable-speed fans or units with digital-scroll compressors.
The compressor(s) respond to a 0% to 100% cooling requirement and the SCR responds to a 0% to 200%
heating requirement based on the temperature proportional band. Figure 3.14 on the facing page,
illustrates SCR reheat on a system with 2 single-step compressors operating in tight mode as follows:
• 70° setpoint
• 8° proportional band
• No dead band
The proportional band is divided evenly on each side of the setpoint, and an additional half of the
proportional band is added to the heating side for 200% heating.
• At 70° air temperature (heating demand 0%), SCR reheat operates at full capacity and
compressor1 operates continuously from 100% cooling demand to 200% heating demand.
• At 200% heating demand, compressor 1 deactivates until the temperature increases to 70°
setpoint (0% heading/cooling demand).
• As cooling demand increases from 0% to 100%, SCR reduces heating capacity proportionally
and stops operating at 100% cooling demand.
• At 100% cooling demand, compressor 2 starts and operates until the air temperature returns to
70° (0% cooling demand) when it stops operation.
– at the same time –
SCR increases heating capacity as the cooling demand decreases from 100% to 0%.
• When temperature decreases below the setpoint, SCR operates at full capacity as the air
temperature drops and heating demand increases from 0% to 200%.
NOTE: Some cooling units are not suited for a strict, NO-LOAD application and require a minimal load in
the space. Consult a Vertiv™ representative for verification.
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Figure 3.14 Temperature control for reheat—SCR in tight mode
No. Description No. Description
1 SCR reheat operation. 5 100% heating.
2 Compressor 1 operation. 6
SCR reheat capacityis decreased as temperature nears 100% cooling,
and compressor 2 stops operating.
3 Compressor 2 operation. 7 SCR reheat stops operating, and Cooling begins operating.
SCR reheat is operates at fullcapacity from
0% to 200% heating,
and compressor 1 stops operating at 200%
4
heating
8 ½ of proportional band.
and remains inactive until temperature
returns to the setpoint.
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3.3.7 Setting Humidifier Options
The type of humidifier used depends on the cooling-unit model and application requirements for your
system.
NOTE: Except for externally-mounted humidifiers, humidifier operation is limited by the return-air
temperature. If return-air temperature reaches 80°F (26°C) or higher, the humidifier is disabled. The
humidifier will not resume operation until the temperature falls to 75°F (24°C) or remains below 80°F
(26°C) for 20minutes.
1. Touch , then > Options Setup > Humidifier Settings.
The HUMIDFIER SETTINGS panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Humidifier Settings options
Humidification System Enabled
Enables/Disables group-wide (network-wide) humidification by the cooling units in the group. Once
enabled at the system level, individual units may be enabled using the Humidification Unit Enabled
paramater.
Humidification Unit Enabled
Enables/Disables humidification at the unit level.
Humidifier Control
Controls humidifier operation.
• Proportional = calculates based on humidification setpoints.
• On-Off = sends a start-stop command to a remote-mounted humidifier.
Humidifier Model
The type of humidifier installed.
Humidifier Steam Rate
Selects capacity of steam generation.
Infrared Flush Rate
Adjustable rate of flush for the infrared humidifier, range 110to500%
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3.3.8 Setting Dehumidification Options
1. Touch , then > Options Setup > Dehumidification Settings.
The DEHUMIDIFICATION SETTINGS panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Dehumidification Settings options
Capacity Increase on Dehum
Capacity increase permitted during dehumidification.
Dehum Fan Ctrl
Enables/Disables fan-speed operation during dehumidification.
Dehum System Enabled
Enables/Disables whether or not the compressor/valve is used for dehumidification when humidity is
above the setpoint.
Dehum Timer
Length of time, in minutes, the dehumidifier may operate.
Dehum Unit Enabled
Enables/Disables dehumidification for the cooling unit.
3.3.9 Setting Water-leak Detector Options
1. Touch , then > Options Setup > Water Leak Detector.
The WATER LEAKAGE DETECTOR panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Water Leak Detector settings options
Water Detector
Type of water-leak detector installed.
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3.3.10 Setting Q15 options
1. Touch , then > Options Setup > Q15 Settings.
The Q15 SETTINGS panel displays.
2. Make adjustments as needed and click Save.
The option settings are updated.
• Touch Cancel to discard the changes without saving.
Q15 Settings options
Damper Switch Feedback Timer
If output function is Damper and End Switch, the length of time iCOM waits for the feedback signal
from the damper motor, that is, if it is open or closed.
Fan Delay for Damper
Length of time that must elapse during damper opening/closing. During this span, all functions
associated with the on/off state are eligible.
Medium Board: Q15 map to K11
Maps the Q15 function to the K11 (warning) relay because a medium-sized board does not have Q15
output.
Q15 Output Direction
Selects whether the output is normally-on or normally-off.
Q15 Output Function
Selects the reason for which the digital output is activated. Options are:
1 = Dehum On 9 = FreeCool ON
3 = Reheat On 10 = Damper
4 = Comp On 11 = High Temp
5 = Comp 1 On 12 = Low Temp
6 = Comp 2 On (in dualcompressor systems)
13 = Loss Power
7 = Humi On 14 = Power Source
Q15 Output Sensor
Selects a sensor reading to compare to the set threshold that activates Q15 output. Options are:
• 0 = Return
• 1 = Supply
• 2 = Rem Max
• 3 = Rem Low
• 4 = Rem Avg
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Q15 Output State
Status of Q15 output, "On" or "Off."
Q15 temp actual
Current value of the sensor selected as the Q15 Output Sensor.
Q15 Temp output threshold
Temperature threshold above or below which Q15 output activates.
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4 MANAGING EVENTS:
ALARMS,WARNINGSANDMESSAGES
Events are notifications of operating status for the cooling unit, its components, and auxiliary devices. All
events are recorded in the Event Log, and alarm and warning events are also displayed on the Alarms
panel (See Viewing the Event Log on page20, and Viewing Unit Alarms on page17.)
In some cases, depending on configuration, an alarm event may power-off the cooling unit, but not always.
However, if a stand-by unit is configured, all alarm events stop the faulty unit and start the stand-by unit.
Message and warning events do not.
4.1 Event Properties
The ALARMS & EVENTS panel lists all events available on the system. You can view and modify events
and the criteria that trigger visual/audible alarms including:
• Critical thresholds
• Time delays
• Enable/Disable
• Event type
• Adding custom events
NOTE: Not all event properties may be adjusted, depending on the criticality of the event,
whichisfactory-set.
To open the panel:
Touch , then > Alarm/Event Setup.
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, the options on your iCOM display may differ.
Alarms & Events panel fields
Property
Lists groups of events, expanding displays the events in each group. See Enabling Events and
EditingEventSettings on the next page.
Type
Event type. See Selecting Event Type and SettingAlarm/WarningNotification on page71.
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Ack.
Indicates type of acknowledgment required. See Acknowledging Alarms on page18. This option is
not available with all alarm types.
• Auto = the alarm is acknowledged automatically. It goes away if the situation that triggered
alarm event is no longer true.
• Manual = the alarm goes away only when acknowledged, even if the situation that triggered
the alarm event is resolved/no longer true.
Reset
Indicates type of reset required for the event (This option is not available with all alarm types):
• Auto = the alarm resets automatically after acknowledgment.
• Manual = the alarm must be reset manually after acknowledgment. See Acknowledging Alarms
on page18.
4.2 Enabling Events and EditingEventSettings
In the ALARMS & EVENTS panel, events are grouped into categories for easier management, for example,
the factory-set remote-sensor alarms and humidification/dehumidification events. In some cases, touch
the group heading provides edit options for the entire group, like thresholds, delays and enable/disable.
Each event includes settings specific for that event and the notification option where event-type and
alarm notifications are selected (See Selecting Event Type and SettingAlarm/WarningNotification on
the facing page).
1. Touch , then > Alarm/Event Setup.
The ALARMS & EVENTS panel opens.
2. Scroll or search to find the event, touch the set’s heading to display the properties and values
for the entire set in the EDIT panel.
– or –
Touch an individual alarm or event to display it’s specific values in the EDIT panel.
NOTE: To edit the event type and notification, see Selecting Event Type and
SettingAlarm/WarningNotification on the facing page.
3. Use the EDIT panel to adjust the settings for the selected event or group of events.
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4.3 Selecting Event Type and SettingAlarm/WarningNotification
Setting notification delays and disabling visual notification prevents nuisance notifications. Customize to
notify of critical events on your cooling system.
NOTE: If the event includes a safety function, such as high pressure, low pressure, main fan overload,
etc., the safety function executes regardless of event type or notification setting. However, notification
timing delays still apply.
Table 4.2 on page75, lists the default and adjustable notification settings for events. Table 4.3 on
page77, describes evens for the Liebert® MCCondenser. Table 4.4 on page79, describes events for the
Liebert® EconoPhase unit. Table 4.5 on page80, describes events for the Liebert® DSE compressors.
Events specific to EEV alarm board on page81, describes events for the EEValarm board.
To select event type and notification:
1. Touch , then > Alarm/Event Setup.
2. Scroll or search to find the event and touch the alarm or event.
3. On the EDIT panel, touch Notifications.
The EDIT panel displays the notification properties.
4. Adjust the notification properties described in the Notification Properties below, then touch
Save.
The notification is updated.
• Touch Cancel to discard the changes without saving.
Notification Properties
Delay
Time, in seconds, to delay notification after event trigger. Depending on the event, the delay may or
may not be adjusted. Table 4.2 on page75, lists the delays and their default settings.
• If the notification delay for the event is greater than the delay set for the event group, the
group’s delay includes the event’s delay.
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Enable
Enables/Disables notification. Touch the switch to set On or Off.
• When disabled, events are not logged or displayed and visual/audible alarm notifications are
not made.
Type
Logging and notification level of the event. Table 4.1 below, describes the event type and
notification it generates. Table 4.2 on page75, lists the default types for events.
Table 4.1 Notification types
Type D escription
Message Stored in event log only. No visualor audible notification.
Warning
Alarm
Listed with a yellow status dot on the ALARMS panel and the LED flashes.
See Table 11.1 on page125, andViewing Unit Alarms on page17.
Listed with a red status dot on the ALARMSpanel, the LED flashes, and the audible alarm sounds.
See Table 11.1 on page125, Viewing Unit Alarms on page17, andEnablingthe Audible Alarm Notification on page81.
Table 4.2 on page75, lists the default settings for each event.
• Internal delay is factory set and not adjustable. It is the time delay after event trigger that
notification is sent.
• Default delay may or may not be adjustable and is added to the internal delay of event
notification.
• Type may be adjustable or may be fixed.
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NOTE: Depending on customization, some events may not be available on your cooling unit.
Table 4.2 Event Notification Defaults
Event Internal delay
Default delay/Range
for adjustment
Type
MAIN FAN OVERLOAD 2 sec 5 sec/0 – 9999 * ALM
LOSS OF AIRFLOW 3 sec 3 sec/0 – 9999 * ALM
CLOGGED FILTERS 2 sec 2 sec/0 – 9999 * WRN
HIGH ROOM TEMP 1 min. after fan on 30 sec /0 – 9999 Fixed to WRN
LOW ROOM TEMP 1 min. after fanon 30 sec/0 – 9999 Fixed to WRN
HIGH ROOM HUM 1 min. after fan on 30 sec/0 – 9999 Fixed to WRN
LOW ROOM HUM 1 min. after fanon 30 sec/0 – 9999 Fixed to WRN
HIGH TEMP SENSOR A 1 min. after fanon 30 sec/0 – 9999 Fixed to WRN
LOW TEMP SENSOR A 1 min. after fanon 30 sec/0 – 9999 Fixed to WRN
HIGH HUM SENSOR A 1 min. after fan on 30 sec /0 – 9999 Fixed to WRN
LOW HUM SENSOR A 1 min. after fanon 30 sec/0 – 9999 Fixed to WRN
COMP 1 OVERLOAD Internal Calc. no ALM
COMP 2 OVERLOAD InternalCalc. no ALM
COMP 1 HIGH PRESSURE Internal Calc. no ALM
COMP 2 HIGH PRESSURE Internal Calc. no ALM
COMP 1 LOW PRESSURE Internal Calc. no ALM
COMP 2 LOW PRESSURE InternalCalc. no ALM
COMP 1 PUMPDOWN FAIL InternalCalc. no ALM
COMP 2 PUMPDOWN FAIL Internal Calc. no ALM
DIG SCROLL1 HIGH TEMP Internal Calc. no ALM
DIG SCROLL2 HIGH TEMP Internal Calc. no ALM
ELHEAT HIGH TEMP 5 sec 0 sec/0 – 9999 WRN
WORKING HRS EXCEEDED 0 sec 0 sec/0 – 9999 Fixed to WRN
SMOKE DETECTED 2 sec 2 sec/0 – 9999 * ALM
WATER UNDER FLOOR 2 sec 2 sec/0 – 9999 * ALM
COND PUMP-HIGH WATER 2 sec 2 sec/0 – 9999 * ALM
LOSS OF FLOW
5 sec
Reset delay: 10 sec
2 sec/0 – 9999* ALM
STBY GLYCOL PUMP ON 2 sec 2 sec/0 – 9999 * ALM
STANDBY UNIT ON 2 sec 2 sec/0 – 9999 * ALM
HUMIDIFIER PROBLEM 2 sec 2 sec/0 – 9999 * ALM
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Table 4.2 Event Notification Defaults (continued)
Event Internal delay
Default delay/Range
for adjustment
Type
NO CONNECTION w/Unit1 Internal Calc. - WRN
UNIT X DISCONNECTED InternalCalc. - WRN
LOSS OF POWER 0 sec no ALM
CUSTOMER INPUT 1 2 sec 2 sec/0 – 9999 * ALM
CUSTOMER INPUT 2 2 sec 2 sec/0 – 9999 * ALM
CUSTOMER INPUT 3 2 sec 2 sec/0 – 9999 * ALM
CUSTOMER INPUT 4 2 sec 2 sec/0 – 9999 * ALM
CALLSERVICE 2 sec 2 sec/0 – 9999 * MSG
HIGH TEMPERATURE 2 sec 2 sec /0 – 9999 * MSG
LOSS OF AIR BLOWER 1 2 sec 2 sec/0 – 9999 * ALM
REHEAT LOCKOUT 2 sec 2 sec/0 – 9999* WRN
HUMIDIFIER LOCKOUT 2 sec 2 sec/0 – 9999 * WRN
FC LOCKOUT 2 sec 2 sec/0 – 9999 * WRN
COMPRESSOR(S) LOCKOUT 2 sec 2 sec/0 – 9999 * WRN
COMP 1 SHORT CYCLE 0 sec 0 – 9999 MSG
COMP 2 SHORT CYCLE 0 sec 0 – 9999 MSG
No Power 0 sec 0 sec/0 – 9999WRN
Condensate 1 Failure 0 sec 5 sec/0 – 9999 WRN
Condensate 2 Failure 0 sec 5 sec/0 – 9999 WRN
EC Fan Fault 0 sec 10 sec/0 – 9999 ALM
HIGH SUP TEMP 0 sec 30 sec/0 – 9999 WRN
LOW SUP TEMP 0 sec 30 sec/0 – 9999 ALM
REDUCED ECO AIRFLOW 0 sec 3 sec /0 – 9999 WRN
ECO HI TEMP OVERRIDE 0 sec 10 sec/0 – 9999 WRN
TEMP CTRL SENSOR FAIL 0 sec 3 sec/0 – 99999 ALM
HIGH DEWPOINT 0 sec 30 sec/0 – 9999 WRN
LOW DEW POINT 0 sec 30 sec/0 – 9999 WRN
HI DEW POINT SENSOR A 0 sec 30 sec/0 – 9999 WRN
LOW DEW POINT SENSOR A 0 sec 30 sec/0 – 9999 WRN
HIGH REMOTE SENSOR 0 sec 30 sec/0 – 9999 WRN
POWER “A” FAILURE 0 sec 10 sec/0 – 9999 ALM
POWER “B” FAILURE 0 sec 10 sec/0 – 9999 ALM
AIRFLOW SENSOR FAILURE 0 sec 10 sec/0 – 9999 WRN
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Table 4.2 Event Notification Defaults (continued)
Event Internal delay
Default delay/Range
for adjustment
Type
HUM CTRL SENSOR FAIL 0 sec 30 sec/0 – 9999 WRN
LOSS OF FLOW 0 sec 5 sec/0 – 9999 ALM
STAT PRES SENSOR FAIL 0 sec 120 sec/0 – 9999 ALM
LOW STATIC PRESSURE 0 sec 120 sec/0 – 9999 WRN
HIGH STATIC PRESSURE 0 sec 120 sec/0 – 9999 WRN
STATPRES OUT OF RANGE 0 sec 150 sec /0 – 9999 WRN
DAMPER FAILURE 0 sec 10 sec/0 – 9999 ALM
BMS DISCONNECTED 0 sec ENABLED/DIS - ENAB WRN
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Table 4.3 on the facing page, describes events available with a Liebert® MC Condenser.
NOTE: A CANbus connection between the Liebert® MC condenser and iCOM is required to trigger
these events.
Table 4.3 Events specific to Liebert MC Condenser
Event Description
• The Liebert® iCOM board cannot establish communication with the Liebert® MC condenser
board for 10 seconds consecutively.
CAN GC 1 or 2
GC 1 or 2 Rem
Shutdown
• Alarm notification displayed for the correspondingcircuit.
• EconoPhase pump operation disabled for the circuit affected.
• When iCOM re-establishes communication with the Liebert® MC board, the event is reset.
• Remote shut-down requested.
• Compressor(s) and EconoPhase pump(s) in the corresponding circuit are powered-off.
• If event occ urs on the lead circuit, then the lead-lagorder of the compressors/tandem banks
changes.
• When the Liebert® MC condenser remote-shutdown circuit returns to inactive state (closed),
the event is reset andthe compressors in that circuit maybe powered-on.
• Normal compressor lead-lag sequence resumes when both compressors are Off.
GC 1 or 2 Board Fail
GC Pres Sens Fail
C1 or C2
GC High Cond
Press C1 or C2
GC Low Cond
Press C1 or C2
GC 1 or 2 Amb
Sens Fail
GC 1 or 2 Amb
Temp Limit
GC Temp Sens Fail
C1 or C2
GC High Cond
Temp C1 or C2
An unrecoverable failure of the Liebert® MC condenser control board has occurred causing a condenser
shutdown.
Condenser pressure-sensor failure
High condensingpressure
Low condensing pressure
Ambient-temperature-sensor failure
High/low ambient temperature
Refrigerant-liquid-line temperature-sensor failure
High refrigerant-liquid-line temperature
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Table 4.3 Events specific to Liebert MC Condenser (continued)
Event Description
GC Low Cond
Temp C1 or C2
GC 1 or 2 Fan 1
through 4 FAIL
GC 1 or 2 TVSS
Failure
Low refrigerant-liquid-line temperature
The followingevents may result from a fan-failure alarm. Refer to the specific fan manufacturer’s literature for
troubleshootinginformation.
• VSD highlink current
• VSD drive error
• VSD earth to ground fault
• VSD electronics heat sink thermal overload
• VSD hall failure
• VSD IGBT failure
• VSD line fault
• VSD motor locked
• VSD motor thermal overload
• VSD phase failure
• VSD-specific uncategorized alarm detec ted
• VSD electronics high-temperature condition
• VSD highlink voltage
• VSD low link voltage
• RS-485 communications failure
TVSS alarm
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Table 4.4 on the facing page, describes events available with a Liebert® EconoPhase™.
Table 4.4 Events specific to Liebert EconoPhase
Event Description
PB1 BOARD FAIL
PB1 CAVITATE
SHUTDOWN
PB1 IN PRES SENS
FAIL
PB1 IN TEMP SENS
FAIL
PB1 INV DATA
SHUTDOWN
PB1 LO DIFF
PRESSURE
PB1 LO OUTLET
TEMP
PB1 OUT PRES SEN
FAIL
PB1 OUT TEMP SEN
FAIL
An unrecoverable failure of the pump control board has occurred. Pump shut down.
• Pump board must be rebooted to reset event.
Pump has cavitated and shut down.
• Event is reset when iCOM requests a new startup.
Inlet refrigerant-pressure-sensor failure. Pump shut down.
• Event is reset when condition clears.
Inlet refrigerant-temperature-sensor failure. Pump shut down.
• Event is reset when condition clears.
Invalid data detected and pump shut down.
• Event is reset when iCOM requests a new startup.
Pump differentialpressure fell below a lower threshold and pump shut down.
Event is reset when iCOM requests a new startup.
Pump outlet-refrigerant temperature fell below a lower threshold and pump was shut down.
• Event is reset when iCOM requests a new startup.
Outlet refrigerant-pressure-sensor failure. Pump shut down.
• Event is reset when condition clears.
Outlet refrigerant-temperature-sensor failure. Pump shut down.
• Event is reset when condition clears.
PB1 CAN
DISCONNECTED
PB1 REMOTE
SHUTDWN
PB1 STARTUP FAIL
PB2 BOARD FAIL
PB2 CAVITATE
SHUTDOWN
PB2 IN PRES SENS
FAIL
PB2 IN TEMP SENS
FAIL
PB2 INV DATA
SHUTDOWN
iCOM lost CAN communications with pump board. Pump shut down.
• Event is reset when condition clears.
Remote shut-down requested. Pump shut down.
• Event is reset when condition clears.
Three pump start-up attempts in a row have failed.
• Event must be reset manually.
An unrecoverable failure of the pump control board occurred. Pump shut down.
• Reboot pump board to reset event.
Pump has cavitated and shut down.
Event is reset when iCOM requests a new startup.
Inlet refrigerant-pressure-sensor failure. Pump shut down.
• Event is reset when condition clears.
Inlet refrigerant-temperature-sensor failure. Pump shut down.
• Event is reset when condition clears.
Invalid data detected and pump shut down.
• Event is reset when iCOM requests a new startup.
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Table 4.4 Events specific to Liebert EconoPhase (continued)
Event Description
PB2 LO DIFF
PRESSURE
PB2 LO OUTLET
TEMP
PB2 OUT PRES SEN
FAIL
PB2 OUT TEMP SEN
FAIL
PB2 CAN
DISCONNECTED
PB2 REMOTE
SHUTDWN
PB2 STARTUP FAIL
PB1 COMMUNICATE
FAIL
Pump differentialpressure fell below a lower threshold and pump shut down.
• Event is reset when iCOM requests a new startup.
Pump outlet-refrigerant-temperature fell below a lower threshold and pump shut down.
• Event is reset when iCOM requests a new startup.
Outlet refrigerant-pressure-sensor failure. Pump shut down.
• Event is reset when condition clears.
Outlet refrigerant-temperature-sensor failure. Pump shut down.
• Event is reset when condition clears.
iCOM lost CAN communication with pump board. Pump shut down.
• Event is reset when condition clears.
Remote shut-down requested. Pump shut down.
• Event is reset when condition clears.
Three pump start-up attempts in a row have failed.
• Event must be reset manually.
Ethernet communications failure. Pump not shut down.
• Event is reset when condition clears.
USB communications failure. Pump not shut down.
• Event is reset when condition clears.
PB2 COMMUNICATE
FAIL
PB1 COND TO PUMP
TEMP
PB2 COND TO PUMP
TEMP
MM Cycle Lock Out
PB Cycle Lock Out
Ethernet communications failure. Pump not shut down.
• Event is reset when condition clears.
USB communications failure. Pump not shut down.
• Event is reset when condition clears.
Temperature variance from condenser 1 output to pump 1 input exceeds allowed parameters. Pump shut
down.
• Event is reset when iCOM requests a new startup.
Temperature variance from condenser 2 output to pump 2 input exceeds allowed parameters. Pump shut
down.
• Event is reset when iCOM requests a new startup.
Liebert® EconoPhase operating in Mixed Mode has failed to control cooling 10 times in 6 hours.
• Mixed Mode operation is disabled untilthe event is manuallyreset.
Liebert® EconoPhase in Pump Mode has failed to control cooling 5 times consecutivelyat full-pumpcapacity temperature conditions.
• EconoPhase operation is disabled until the event is manuallyreset.
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Table 4.5 below, describes events available with the Liebert® DSE compressor.
Table 4.5 Events specific to Liebert DSE compressor
Event Description
COMP 1A OVERLOAD
COMP 1B OVERLOAD
COMP 2A OVERLOAD
COMP 2B OVERLOAD
COMP 1A HRS
EXCEEDED
COMP 1B HRS
EXCEEDED
COMP 2A HRS
EXCEEDED
COMP 2B HRS
EXCEEDED
COMP 1A HIGHTEMP
Compressor overloaded.
• The corresponding compressor is disabled until the condition resets. Some external
overloads may require the device to be reset manually.
Compressor run-hour limit exceeded by actualrun hours.
COMP 1B HIGH TEMP
COMP 2A HIGH TEMP
COMP 2B HIGH TEMP
COMP 1A DISCH
SENSOR FAIL
COMP 1B DISCH
SENSOR FAIL
COMP 2A DISCH
SENSOR FAIL
COMP 2B DISCH
SENSOR FAIL
COMP 1A SHORT
CYCLE
COMP 1B SHORT
CYCLE
COMP 2A SHORT
CYCLE
COMP 2B SHORT
CYCLE
CIRCUIT 1 HIGH PRESS
CIRCUIT 2 HIGH
PRESS
High discharge temperature. Compressor is powered-off.
Compressor discharge pressure sensor failed.
Compressor exceeded the maximum number ofstop/starts allowed in the time period.
Circuit 1 or 2 high discharge pressure
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CIRCUIT 1 LOW PRESS
Circuit 1 or 2 low suction pressure
CIRCUIT 2 LOW PRESS
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Table 4.6 below, describes events available with the EEV alarm board.
Table 4.6 Events specific to EEV alarm board
Event Description
EEV1 or 2
Communication
Error
EEV1 or 2 Sensor
Error
EEV1 or 2 Motor
Error
EEV1 or 2 Low
Superheat
EEV1 or 2 High
discharge temp
EEV1 or 2
Feedback Failure
EEV1 or 2 Battery
Warning
iCOM lost communication with the EEV board.
• The compressor(s) shut-off and the unit exits EconoPhase while the error is active.
iCOM lost communication with a connected EEV sensor.
• If a sensor value is not reported for 10 seconds, a sensor error occurs. The compressor(s) shutoff and the unit exits EconoPhase while the error is active.
• If 4 sensor errors occur in a 30-minute window, the Sensor Error event remains active until reset
manually.
Problem with the stepper motor.
• The corresponding compressor(s) are disabled untilthe condition is cleared.
Superheat dropped below 1°F (–17°C) for 1 minute.
• The corresponding compressor(s) are powered-off for the minimum “off time” while the event is
active.
Discharge temperature exceeded the high-temperature threshold.
• The corresponding compressor(s) are powered-off untilthe alarm is manually reset.
The EEVcontrol monitors feedback from the compressor contactor. Feedback Failure is reported if the
contactor is de-energized while the EEV is operating for superheat control.
• The corresponding compressor is disabled until the alarm is manuallyreset.
The EEVcontrol tests the EEVbattery back-up (if included), and indicates low battery life.
• If this warningremains active for 24 hours, a Battery-failure event occurs and the c ircuit is lockedout.
EEV1 or 2 Battery
Failure
EEV1 or 2 D river
Failure
Comp 1 or 2 High
Superheat
The EEVcontrol tests the EEVbattery back-up (if included), and indicates battery failure.
• The corresponding EEV circuit is locked-out untilthe failure code is reset. See Resetting EEV
Battery-failure Counter on page130.
EEVunexpectedlyc loses with the compressor(s) powered-on.
• The corresponding compressor is disabled until the alarm is reset manually.
Superheat is above the high threshold for 30 minutes.
• The compressor is powered-off for the minimum “off time.”
4.4 Enabling the Audible Alarm Notification
1. Touch , then > Display Options > Display Properties.
The UNIT DISPLAY panel opens.
2. Touch the Alarm Buzzer Pattern value, and select a pattern from the drop-down list.
• Selecting None disables the audible notification.
3. Touch Save to save the property settings.
• Touch Cancel to discard changes.
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4.5 Remote-alarm Device and Customer-input Events
Remote-alarm devices are various sensors and detectors outside the cooling unit that provide information
about conditions and situations that may affect operation. RAD include smoke detectors, filter-condition,
valve status.
Included in the remote-alarm devices (RAD) option are up to 4 customer-input events depending on
cooling-unit configuration. In some cases, 2 additional, optional customer-input events are available. See
Setting-up Customer-input Events below.
RAD and customer-input notifications are set in the same way as other events. See Selecting Event Type
and SettingAlarm/WarningNotification on page71.
4.5.1 Setting-up Customer-input Events
Input devices must be wired to Terminal 24 through a dry contact to locations 50, 51, 55 and 56 for alarms
1 through 4 respectively (For the terminal location, refer to the cooling-unit electrical schematic and
installation manual). Table 4.7 below, maps the customer input to the remote-alarm devices (RAD).
Table 4.7 Customer-input terminals to RAD terminals
Customer Input Customer- input Terminal RAD Number RAD Terminal
1 24 1 50
2 24 2 51
3 24 3 55
4 24 4 56
1. Touch , then > Alarm/Event Setup > Remote Alarm Device Input.
The EDIT panel opens.
2. In Customer Input X (where X is the input number), select the input type that best describes
the wired device/input, see Table 4.8 on page85.
3. In Customer Input X Active When, select whether the input is active (triggers events) when
Opened or Closed.
4. Once input(s) are set, touch Save.
The customer-input settings are saved.
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Customer-input options
Customer Input X
Selects the customer-wired input, where X is the input number. See Table 4.8 on page85, for a
description of available values.
Customer Input X Active When
Selects when the input triggers an event. Options are:
• Opened = events are triggered when the contacts across the corresponding RAD terminal
strip are open.
• Closed = events are triggered when the contacts across the corresponding RAD terminal strip
are closed.
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NOTE: Depending on customization, some events listed in Table 4.8 on the facing page, may not be
available with your system.
Table 4.8 Customer-input Options
Input Action/Description
Smoke Event only.
Water Alarm Event only.
C PMP Alarm Event only.
Flow Alarm Event only.
Stdby G Pmp Event only.
Stdby Unit Event only.
C-Input 1 Event only.
C-Input 2 Event only.
C-Input 3 Event only.
C-Input 4 Event only.
Rht Lockout Event + Electric heaters disabled.
Hum Lockout Event + Humidifier disabled.
Rht+Hum Lock Event + Electric heaters and humidifier disabled.
Comp Lockout Event + Compressor(s) disabled w/o pump down.
Call Service Event only.
High Temp Event only.
Air Loss Event only.
FC Lockout Event + Free-coolingdisabled.
Heater Alarm Event + Heaters off.
Flow AL SD Event + Shut-down the unit.
Flow AL LC
Comp Lock PD Event + Compressor(s) disabled w/ pump down
Enable FC Forces free-cooling to “On.”
HTRJ VFD Activates the HEAT REJ VFD ALARM. No other function.
HTRJ SPD Activates the HEATREJ SPD ALARM. No other function.
FIRE ALARM Event + Shuts-down the unit.
2ND SETPOINT No event, but switches to the second setpoint.
Emergency Power Event + Disables unit.
LSI Event + Activates humidifier-problem Alarm and stop filling bottle when full.
Event + Lockout compressors, no pump down. (Enabled only if at-least one compressor is operating. Autoreset depends on input status.)
COND 1 FAIL Event only.
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Table 4.8 Customer-input Options (continued)
Input Action/Description
COND 2 FAIL Event only.
D-SCROLL RED Event + Reduces requested compressor capacity by 20%.
SWAP VALVE
No event -Active X valve closes and Y opens/Inactive Y closes and X opens. See 7.3 - Custom Dual Chilled
Water Valve Staging.
EC FAN FAULT Event + Set analogoutput to 10V.
ECO AIRFLOWEvent + Reduce Liebert® air economizer air flow.
DAMPERSWITCH Damper + Endswitch.
POWER A Event only.
POWER B Event only.
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5 U2U NETWORKING
iCOM-controlled thermal-management units connected in an Ethernet unit-to-unit (U2U) network are
able to efficiently cool and control humidity in the conditioned space by exchanging data in several
modes of operation.
U2U networking is required to set up and control the following operating features:
• Teamwork
• Stand-by (lead/lag)
• Rotation
• Cascading
NOTE: The U2U network must be separate from other networks. Use a communication card, such as a
Liebert® IntelliSlot™ Unity, to communicate securely between your building-management system or
other networks.
5.1 Preparing for U2U Group Set-up
Cooling units in the network will be assigned to groups, which affects how units function in teamwork,
stand-by, rotation, and cascading operations. Especially in large rooms, it is important to consider several
factors before setting-up groups to balance cooling-unit operation with room conditions.
NOTE: For ease of set-up and use, we recommend using only 1 group unless you have multiple rooms,
differing software versions, or different types of cooling units.
1. Make a map of the room and indicate the location of all heat-generating devices and cooling
units to plan for proper heat-load management and cooling-air distribution.
2. Note the type of units by product/model, size, etc.
3. Determine the number of units to network together to ensure proper air flow and
environmental control, up to 32 units.
4. Determine number of stand-by units.
5. Determine if using teamwork and if so, which mode.
6. Plan U2U address assignments.
• Refer to the U2U Display and Control-board settings on page89, for guidelines assigning
cooling-unit control-board addresses and iCOM display-board addresses.
• Balance/Alternate unit address assignments based on room layout and because standby and teamwork operate in numeric order by unit number. Figure 5.1 on the next page,
shows an example layout assignment with half of the cooling units in stand-by and half
operating. Without a plan, adjacent units could be operating or inactive, which may not
provide proper heat-load balance or efficient use of cooling capacity.
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7. Read and record all programmed settings for each of the individual units (see Backing-up,
Importing/Exporting and Restoring Display Settings on page121).
8. Verify that network cabling and switches are provided, ready to connect, and labeled by-unit
at the network switch.
NOTE: Cooling units are factory-wired for stand-alone operation. Do not connect the U2U network
cabling before setting the U2U network configuration/groups. Network communication conflicts and
unreliable display readings will result. Configure the network using Configuring U2U Network Settings
on the facing page, then refer to U2U Wiring connection on page161, to connect the network cabling
and hardware.
Figure 5.1 Example layout stand-by/operating unit-address assignment
Item Description
1 to 10 Assigned address of the thermal-management unit.
11 Operatingunits.
12 Units on stand-by
13 Network switch
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5.2 Configuring U2U Network Settings
NOTE: Always change and save the control-board settings first. If you change the display settings
first, you could lose access to the control board via iCOM.
The U2U NETWORK SETTINGS configure iCOM’s unit-to-unit communication andincludes
informationbuttons, , that display pop-up field descriptions. The panel also indicates issues with the
network settings. For resolution, see Troubleshooting Network-settings Issues on page91.
To configure unit-to-unit networking:
1. Touch , then > BMS & Teamwork Setup > U2U Setup.
The U2U NETWORK SETTINGS panel opens.
2. Touch the field to edit.
The keypad opens.
3. Type the entry and touch .
4. When all fields to edit are updated, touch Save & Restart.
NOTE: Depending on the changes made, the Save button updates to indicate the components that
need rebooted or restarted. If the control board reboots, the cooling unit suspends operation for 60
seconds, then resumes operating.
U2U Display and Control-board settings
Broadcast
Logical address at which connected units receive datagrams.
NOTE: Messages sent to the broadcast address is typically received by all network-attached hosts.
CB Firmware Version
Display configuration based on the firmware version of the control board. Depends on your cooling
unit as follows:
• CR-2.03 = CRV
• PA-2.01 = CW/DS
• PA-2.04 = DSE
• PA-2.05 = DSE, PDX/PCW, Mini-Mate
• PA-2.06 = CW/DS, DSE, PDX/PCW, Mini-Mate
NOTE: CB Firmware Version does not alter or affect the firmware running on the control board. It only
updates the display configuration. If incorrect, menus and data in the iCOM display will be invalid or
missing.
Gateway
Routes data and acts as proxy server/firewall for display and control board during network set-up.
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Generate U2U Compatible Broadcast
Facilitates U2U communication between the display and control board.
NOTE: Do not un-check. Failure to generate the compatible broadcast address results in loss of
communication between the display and control board.
IP Address
Network address of the display and control board.
NOTE: Last 3 digits must be a unique value and need not be sequential. However, we recommend that
they match the U2U address for easier reference later.
Netmask
Divides IP addresses in subnet and specifies network available to hosts for the display and control
board. Display and control-board Netmask must be identical on the U2U network.
MAC Address
Unique, read-only identifier of the display or control-board Ethernet device.
U2U Address
For the display, a unique identifier for each display on the U2U network. Address range is 33 to 64.
For the control board, a unique identifier for each control board on the U2U network. Address range
is 1to32 and must be consecutive from the previous control-board address in the U2U group. This is
the address used for stand-by/lead-lag and cascade operation, see Figure 5.1 on page88.
NOTE: For both board and display, we recommend matching the U2U address to the last 3 digits of the
IP address for easier reference later.
U2U Group
For the display, select the zone/group to which the unit belongs.
For the control board, selects the zone/group with which the unit will be configured in
teamwork/stand-by/rotation scenarios.
NOTE: Units with a specific thermal area of influence should be assigned to the same zone/group,
typically when a network spans separate rooms rather than by aisles. Groups are also handy when
cooling units vary by cooling type, compressor type, or version of iCOM firmware and otherwise do not
operate together efficiently or at all.
U2U Target Address
The address of the control board targeted by the display.
• The unit’s U2U target address must match the control-board U2U address.
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5.2.1 Troubleshooting Network-settings Issues
At the bottom of the U2U NETWORK SETTINGS panel, an Issues button indicates whether or not there
are problems with the network settings. The button indicates the number of issues and changes color
when a problem exists, see Table 5.1 below.
Table 5.1 Issues-button status colors
Color Descript ion
Green No problems. Number of issues is zero.
Red Problem(s) detected. Number of issues displays.
To view network issues:
1. When an issue is indicated, touch the Issues(s) button on the U2U NETWORK SETTINGS
panel.
The ISSUES dialog opens.
2. Note the problems and Close the dialog, then address the issue:
• Touch the setting to correct.
The on-screen keyboard opens.
• Make adjustments and touch Go.
• Continue making corrections until no problems are indicated.
3. Verify that unit-to-unit communication is established, then touch Save.
NOTE: Depending on the changes made, the Save button updates to indicate the components that
need rebooted or restarted. If the control board reboots, the cooling unit suspends operation for 60
seconds, then resumes operating.
5.2.2 Modifying U2U Network Settings
1. Touch , then > BMS & Teamwork Setup > U2U Setup.
The U2U NETWORK SETTINGS panel opens.
2. Touch the setting to edit and make adjustments, then touch .
3. Verify that unit-to-unit communication is established, then touch Save.
NOTE: Depending on the changes made, the Save button updates to indicate the components that
need rebooted or restarted. If the control board reboots, the cooling unit suspends operation for 60
seconds, then resumes operating.
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6 TEAMWORK, STAND-BY AND
ROTATIONFORCOOLINGUNITS
iCOM Unit-to-unit (U2U) communication via private network and additional hardware (see U2U
Networking on page87) allows the following operating features for the cooling units:
• Teamwork
• Stand-by (Rotation)
• Cascade
6.1 Continuous Control with Virtual Master
The Virtual Master function maintains smooth control if group communication is compromised. In these
operating configurations, a lead (“master”) unit is in charge of component staging in teamwork mode, unit
staging, and stand-by rotation. If the lead unit gets disconnected, iCOM automatically assigns a virtual
master, which assumes the responsibilities of the lead unit until communication is restored.
6.2 Teamwork Modes
When iCOM-controlled thermal-management units are connected to a network in a group or “team,” use
teamwork to optimize performance and efficiency depending on the mode chose and its application.
In a panel with “Status” content, the Teamwork Mode icon indicates the mode selected, Figure 6.1 on the
next page. Touching the icon displays the Teamwork dialog from which you can access the teamworkcontrol settings.
To set up team work:
1. Touch the Teamwork-mode icon, then touch Edit on the teamwork dialog.
– or –
Touch , then > BMS & Teamwork Setup > Teamwork / Standby > TeamworkMode.
2. Select the mode from the Teamwork Mode drop down in the TEAMWORK MODE CONTROL
panel.
The TEAMWORK/STANDBY panel opens.
3. Touch Save.
Teamwork mode is set.
• Touch Cancel to discard changes.
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Figure 6.1 Teamwork icons
Item Description
1 No teamwork.
2 Mode 1 - Parallelteamwork
3 Mode 2 -Independent teamwork
4 Mode 3 - Optimized aisle teamwork
NOTE: Depending on the type of thermal-managment unit, included components, and control settings
of your system, all of the options listed may not be available on your iCOM display.
Teamwork Control options
Cascade Units
Stages-on stand-by units based on room temperature/humidity load. AvailableinTeamworkmodes
1 and 3, the options differ for each:
• Teamwork mode 1 - Parallel options are:
• Yes = stand-by units cascade-on based on a call for heating, cooling, humidification, or
dehumidification.
• Cool/Heat = stand-by units cascade-on with a call for heating or cooling only.
• Cooling = stand-by units cascade-on with a call for cooling only.
• Teamwork mode 3 - Optimized Aisle options are:
• Fan PI = stand-by units cascade-on based on the inability of active units to reach
setpoint temperature or if using static-pressure control, setpoint pressure while
operating at full capacity.
• Fanspeed = stand-by units cascade-on based on the inability of active units to reach
setpoint temperature or if using static-pressure control, setpoint pressure while
operating at full fan speed.
Cascaded Units Delay
Length of time in minutes to delay the activation of a stand-by unit after the previously-activated
unit starts, to prevent staged-cascaded units from starting too close together or at the same time.
Cascaded Units Min Run
Length of time in minutes that an cascade-on unit must run before powering-off.
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